If the ECLKDIV EEPROM clock divider register has been loaded, and the

EEPROM is not executing a command (EEPROM CCIF command complete flag is

set), the execution of a STOP instruction will erroneously set the

ACCERR access error bit in the ESTAT EEPROM status register. 

The ACCERR bit in the ESTAT register must be cleared after the execution

of a STOP instruction if the ECLKDIV register has been loaded. 

This Erratum applies only to systems where PLL is used to divide down

the osc_clock by a ratio between 2 and 3.



If



1) pll_clock (PLLON=1) is running

and

2) 2 < osc_clock/pll_clock < 3

and

3) full stop mode is entered (STOP instruction with PSTP Bit =0) 



there is a small possibility that when entering full stop mode the chip 

reacts as follows:

1) if self clock mode is disabled (SCME=0)  monitor reset is asserted.

   The system does NOT enter stop mode.

or

2) if self clode mode and SCM interrupt are enabled (SCME=1 and SCMIE=1)

   a self clock mode interrupt is generated. The SCMIF flag is set.

   The system does NOT enter stop mode.

or

3) if  SCME=1 and SCMIE=0 the system will enter full stop mode. 

   But after wakeup self clock mode is entered without doing the 

   specified clock quality check. The SCMIF flag is set. 

1) Avoid osc_clock/pll_clock ratios between 2 and 3.

or

2) if you really require osc_clock/pll_clock ratio between 2 and 3

do the following before going into stop.

a) deselect PLL (PLLSEL=0)

b) turn off PLL (PLLON=0)

c) enter stop

d) exiting stop: turn on PLL again (PLLON=1) 

Starting a command sequence with a MOVB array write instruction (Byte

Write) will not generate an access error. The command is processed

normally programming the array according to the content (word) of the

data register while only the high byte in the FDATA register holds valid

information. 

Avoid the use of MOVB instruction for array program operations. 

Starting a command sequence with a MOVB array write instruction (Byte

Write) will not generate an access error. The command is processed

normally programming the array according to the content (word) of the

data register while only the high byte in the FDATA register holds valid

information.

 

Avoid the use of MOVB instruction for array program operations. 

Starting a new conversion by writing to the ATDCTL5 register should

clear all CCF flags in the ATDSTAT2/1 registers.

This does not always work if the write to ATDCTL5 register

occurs near the end of an ongoing conversion.

Although all CCF flags are cleared one CCF flag might be

set again within the 1st ATD clock period of the new conversion.

 

If the unexpected setting of one CCF flag can not be

accepted by the application one of the following

workarounds can be taken:

1) o Abort conversion (e.g. by write to ATDCTL3)

   o pause for 2 ATD clock periods

   o Start new conversion

2) o ignore first conversion sequence and clear CCF flags 

Breakpoints are temporarily disabled while the MCU is executing BDM

firmware code when operating in active BDM mode. It logically follows

that debug module triggers are disabled in the same manner. While tagged

triggers are disabled, forced triggers are not and therefore may cause

the debug module to trigger erroneously.



In most circumstances this will only be a problem in outside range

trigger mode. In order to see an erroneous trigger in another trigger

mode, a forced trigger must be configured in the BDM firmware address

range ($FF00-$FF80) and an exact address bus match must occur. This

memory area would typically contain interrupts, vectors or program code,

and would therefore be a very unlikely location for the configuration of

a forced trigger address.  

Outside range trigger mode should not be used when configuring forced

triggers if the trigger range contains the memory area where the BDM

firmware code resides ($FF00-$FF80) and the user intends to operate the

MCU in active BDM mode. 

When the foreground receive buffer (RxFG) is read, with the Receiver

Full Flag (RXF) set, the value of the Time Stamp Register may be

incorrect due to corruption. The Time Stamp Register is written

correctly when the message is received, but may be overwritten by the

timer value at the end of a subsequent reception. The corruption can

only occur close to a data overrun, when the receive buffer FIFO is

full.



The problem occurs whenever the following two conditions are met: 



1. Receive buffer system is full 

All five receive buffers contain valid messages waiting to be read by

the application. 



2. Another valid message is seen on the bus. This message must be sent

from another node, i.e. it must not be transmitted from the respective

msCAN module itself. 



At the end of the message in 2. the Time Stamp Register of the oldest

message in the receive FIFO is overwritten. 



Note: if the message in 2. passes the message filter system the Overrun

Interrupt Flag (OVRIF) is also set. 

The application software has to ensure to read the receive messages in

due time to avoid data overrun in any case. This will automatically

minimize the risk of a Time Stamp Register overwrite event. 

If the ACCERR access error flag is set before the first write of the 

flash clock divider register, the mechanism for retaining and 

protecting the initial write access to the clock divider register will 

not function as specified. This register can be overwritten for as long 

as the ACCERR flag remains set, contrary to the specification which 

states that the register is write once. 

Clear the ACCERR flag before writing the clock divider register for the 

first time. 

The errata concerns the DBG-CPU interface in DBG mode whilst configured

for tagging. If an interrupt occurs at the moment that a tag is attached

to an opcode being loaded into the instruction queue, the flag will get

set, but the part may not enter active BDM mode. 



Using the DBG configuration BDM=DBGBRK=1, BEGIN=0, an event causing a

flag to be set should cause a break to BDM. The flag gets set, but the

part does not enter active BDM mode. The CPU executes the interrupt

service routine, instead, and returns to the correct position in the

program flow, but the breakpoint to BDM is missed.



The problem does not occur if the DBG module is configured for operation

in BKP mode (BKABEN=1). This is because, even if the flag bit is set,

the BKABEN bit is not cleared. On returning from the interrupt service

routine, the tag is re-applied when the PC is fetched after the

interrupt service routine, and the part enters BDM after the interrupt

service routine. In BKP mode with TRGSEL=0, no flags are set when a

taghit occurs. 



In BKP mode with TRGSEL=1, the flag is also set erroneously on entering

the interrupt service routine. However, it is unlikely that a user would

be affected by the flag being set early (unless the service routine were

exceptionally long), due to the length of time needed to read out the

DBGSR (flag bits) over the BKGD pin; typically, during this time, the

part would enter active BDM when the tag is re-applied. 

None.

The Flash memory test module read-access timing limits the bus frequency

achievable for production test. 

Operate the device at a maximum frequency of 16MHz

 

Upon leaving BDM active mode, the CPU return address is stored

temporarily for a few cycles in the BDM shift register. If a BDM command

transmission is detected during this time, the return address will be

manipulated in the BDM shift register. This situation is likely to occur

when a CPU BGND instruction is executed in user code during debugging

under the following conditions:



(i) The BDM module is not enabled AND

(ii) BDM commands are sent from the host



If this situation occurs, the CPU will execute BDM firmware and will

check the status of the ENBDM bit in the BDMSTS register. If the BDM is

disabled, the ENBDM bit will be clear, and hence the BDM firmware will

be exited and the shift register manipulation described above will occur. 

Avoid using the BGND instruction when the ENBDM bit in the BDMSTS

register is cleared. 

At oscillator frequencies above 4MHz the Program step of the EEPROM

Sector-Modify command can fail depending on the bus frequency. As a

result, no programming of the EEPROM occurs. There is no impact to the

Erase step of the Sector-Modify command. Since a partial programming of

the word cannot occur, there is not a reliability issue caused by the

Sector-Modify command if the programmed word is verified.

 

   Oscillator             Bus

   Frequency           Frequency

   ----------    ----------------------

     4MHz             No Issue

     8MHz        Fbus <20MHz : No issue

    16MHz        Fbus <16MHz : No issue





 

Use seperate Erase and Program commands in place of the Sector-Modify

command. If the Sector-Modify command is used and fails the program step

as confirmed by a user verification step, a Program command alone can be

used to effectively complete the operation since the erase step does

successfully erase the sector. 

If the ECLK is used as an external bus control signal (ESTR=1) the first

external access is lost after switching from a single chip mode with

enabled ECLK output to an expanded mode. The ECLK is erroneously held in

the high phase thus the first external bus access does not generate a

rising ECLK edge for the external logic to latch the address. The ECLK

stretches low after the lost access resulting in all following external

accesses to be valid. 

Enter expanded mode with ECLK output disabled (NECLK=1). Enable the ECLK

after switching the mode before executing the first external access. 

With the SPI configured as a slave, clearing the SPE bit (to disable 

the SPI) together with clearing the CPHA bit while the SS pin is low 

causes the transmit shift register to be locked for the next 

transmission following the SPI being re-enabled as a slave with SS 

still being low. 



This means new transmit data is not accepted for the first 

transmission after re-enabling the SPI (indicated by SPTEF staying low 

after storing transmit data into SPIDR), but for the next following 

transmission.



 

When disabling the slave SPI, CPHA should not be cleared at the same time. 

Starting a conversion with a write to ATDxCTL5 or on an external trigger

event, and aborting immediately afterwards with a write to ATDxCTL0,

ATDCTL1, ATDxCTL2 or ATDxCTL3 can fail to stop the conversion process. 

Only write to ATDxCTL4 to abort an ongoing conversion sequence.



Use the recommended start and abort procedures from the Block Guide.

Section : Initialization/Application Information 

Subsection: Setting up and starting an A/D conversion 

Subsection: Aborting an A/D conversion 

If the range of Flash addresses to be compressed is 32K or greater, the

data at one of the addresses will be effectively ignored. The address

affected is 32K from the upper address read in the data compress

algorithm, e.g., for an address range of 32K, the first data read in the

algorithm will not affect the final signature provided by the algorithm.

 

Limit range of addresses to be compressed to less than 32K addresses.

Execute multiple data compress commands to compress larger Flash address

ranges. 

The initial eight ID bits will be corrupted if a message is set up for

transmission during the third bit of INTERMISSION and a dominant bit is

sampled leading to an early-SOF*.



The CRC is calculated from the resulting bit stream so that the

receiving nodes will still validate the message.



An early-SOF condition may only occur if the oscillators in the network

operate at a tolerance range which could lead to a cumulated phase error

after 11 bit times larger than phase segment 2. 



In case arbitration is lost during transmission of the corrupt

identifier, a non-corrupted ID will be sent with the next attempt if the

transmit request remains active.



*The CAN protocol condition referred to as 'early-SOF' in this erratum

is detailed in "Bosch CAN Specification Version 2.0" Part A, section 9,

and a Note to section 3.2.5 INTERFRAME SPACING – INTERMISSION in Part B. 

Due to increased oscillator tolerance a transmission start in the third

bit of intermission is possible and allowed. The errata can be avoided

when calculating the maximum oscillator tolerance of the overall CAN

system. The phase error after 11 bit times due to the oscillator

tolerance should be smaller than phase segment 2.



If an early-SOF cannot be avoided the following methods will provide

prevention:



- Assigning the same value to all upper eight ID bits in the network

- Allocating dedicated data length codes (DLC) to every identifier used 

  in the network and checking for correspondence after reception

- Assigning only IDs (x) which do not consist of a combination of other 

  assigned IDs (y,z) and using the acceptance filters to reject 

  erroneous messages, i.e. 

  - for standard frames: IDx[11:0]  != {IDy[11:3], IDz[2:0]}

  - for extended frames: IDx[28:21] != {IDy[28:21],IDz[20:0]} 

It is possible that after the device enters Stop or Pseudo-Stop mode it

may reset rather than wake up normally upon reception of the wake-up

signal. 



CONDITIONS: This event will only happen provided ALL of the following

conditions are met: 

    1) Device is powered by the on-chip voltage regulator. 

    2) Device enters stop or pseudo-stop mode by execution of STOP

instruction by the CPU (provided the S-bit in CCR is cleared) 

NOTE: The part enters stop mode either after 12 oscillator clock cycles

with the PLL disengaged or 3 PLL clock cycles and 8 oscillator clock

cycles with the PLL engaged after the STOP command is executed. 

    3) The wake-up signal is activated within a specific very short

window (typically 11ns long, not longer than 20ns). The position of the

window varies between different devices, however it never starts sooner

than 1.6µs and never ends later than 4.7µs after the stop mode entry. 



This really narrow width of the susceptible window (20ns maximum) makes

the erratum unlikely to ever show in the applications life. 



The incorrect behavior will never occur if ANY of the wake-up conditions

are met at the time when the stop mode entry is attempted (an enabled

interrupt is pending). 



EFFECT: 

If this incorrect behavior occurs, the device will Reset and indicate a

Low Voltage Reset (LVR) as the reset source. 

The device will operate normally after the reset.  

None. 



-- 



Asynchronous Low Voltage Resets are possible in any microcontroller

application (due to power supply drops) and the integrated LVR and LVI

features and dedicated LVR reset vector are provided to manage this fact

cleanly. For best practice, the application's software should be written

to recover from a Low Voltage Reset in a controlled manner. An

application software written to deal with valid Low Voltage Resets

should correctly manage erroneous LVR events. 



It can also be possible to avoid erroneous Low Voltage Resets from

synchronous wake-up events by configuring the application software to

ensure that the entry into stop occurs at such a time, in relation to

the wake-up event timer, that a wake-up event does not occur within

1.6µs to 4.7µs after Stop/Pseudo-Stop entry.  

If the PWM emergency shutdown feature is enabled (PWM7ENA=1) and PWM

channel 7 is disabled (PWME7=0) another lower priority function

available on the related pin can take control over the data direction.

This does not lead to a problem if input mode is maintained. If the

alternative function switches to output mode the shutdown function may

unintentionally be triggered by the output data.

 

When using the PWM emergency shutdown feature the GPIO function on the

pin associated with PWM channel 7 should be selected as an input. 



In the case that this pin is selected as an output or where an

alternative function is enabled which could drive it as an output,

enable PWM channel 7 by setting the PWME7 bit. This prevents an

active shutdown level driven on the (output) pin from resulting in an

emergency shutdown of the enabled PWM channels.

 

When an OC7M bit is set, an erroneous normal output compare event can 

happen on a timer port if the compare action is selected as "Timer 

disconnected from output pin logic ".

 

Corresponding configuration:

*  TIOSx = 1 --> Output compare mode

*  OMx = OLx = 0 --> Output compare logic disconnected from the pin

*  OC7Mx = 1 --> Mask bit set for OC7 event











 

Set OC7Mx = 1 only for channels where the output compare action should 

drive the pin, and OC7Mx = 0 for all other channels where the pin is 

required to be disconnected from the output compare logic. 

The pulse width of an output compare (which resets the free running

counter when TCRE = 1) will measure one more bus clock cycle than 

expected. 



 

The specification has been updated. Please refer to revision 01.09 (07

May 2010) or later.



In description of bitfield TCRE in register TSCR2,a note has been added:

TCRE=1 and TC7!=0, the TCNT cycle period will be TC7 x "prescaler

counter width" + "1 Bus Clock". When TCRE is set and TC7 is not equal to

0, then TCNT will cycle from 0 to TC7. When TCNT reaches TC7 value, it

will last only one bus cycle then reset to 0.











 

In low power modes (stop/p-stop/wait – PSWAI=1) and during PWM PP7

de-assert and when PWM counter reaching 0, the PWM channel outputs

(PP0-PP6) cannot keep the state which is set by PWMLVL bit.  



 

Before entering low power modes, user can disable the related PWM 

channels and set the corresponding general-purpose IO to be the PWM 

LVL value. After a intend period, restart the PWM channels.

 

When the PWM is used in 16-bit (concatenation) channel and the emergency

shutdown feature is being used, after de-asserting PWM channel 7

(note:PWMRSTRT should be set) the PWM channels (PP0-PP6) do not show the

state which is set by PWMLVL bit when the 16-bit counter is non-zero. 

 

If emergency shutdown mode is required:



In 16-bit concatenation mode, user can disable the related PWM 

channels and set the corresponding general-purpose IO to be the PWM 

LVL value. After a intend period, restart the PWM channels.