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MKMxxZxxACxx5 Bare Metal Software Drivers
R4.1.6
Reference Manual
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This section summarizes boot sequences supported by the MKM34Z128CLL5 device and ways of their entering by means of modifications performed in the appconfig.h
file. Each particular boot mode is characteristic by a peak current, average current and duration of the power up cycle. These characteristics measured during power up cycle of the real device including transient responses of the RESET signal and IDD current are the following:
RUN Boot Fast Clock - Flash Clocked by 25 MHz During Initialization (default). Mode entered by all "BOOT_..." constants commented in the
appconfig.h
configuration file.
Supply Voltage Ramp | Supply Voltage (V) | Peak Current (mA) | Mean Current (mA) | Boot Time (ms) | Boot Energy (Ws) |
---|---|---|---|---|---|
linear 1.7 ms settling time | 3.26 | 4.75 | 1.39 | 1.3 | 2.87e-6 |
RUN Boot Slow Clock - Flash Clocked by 25 MHz During Initialization. Mode entered by "BOOT_DIV_CLK_BY_8" constant left uncommented in the
appconfig.h
configuration file.
Supply Voltage Ramp | Supply Voltage (V) | Peak Current (mA) | Mean Current (mA) | Boot Time (ms) | Boot Energy (Ws) |
---|---|---|---|---|---|
linear 1.7 ms settling time | 3.26 | 5.44 | 1.75 | 4.0 | 19.86e-6 |
RUN Boot Fast Clock - Flash Clocked by 1 MHz During Initialization. Mode entered by "BOOT_EXT_CLK" constant left uncommented in the
appconfig.h
configuration file.
Supply Voltage Ramp | Supply Voltage (V) | Peak Current (mA) | Mean Current (mA) | Boot Time (ms) | Boot Energy (Ws) |
---|---|---|---|---|---|
linear 1.7 ms settling time | 3.26 | 3.18 | 1.67 | 2.4 | 9.36e-6 |
RUN Boot Fast Clock and Entering VLPR in SW - Flash Clocked by 1 MHz During Initialization. Mode entered by "BOOT_SWVLPR_MODE" and "BOOT_EXT_CLK" constant left uncommented in the
appconfig.h
configuration file.
Supply Voltage Ramp | Supply Voltage (V) | Peak Current (mA) | Mean Current (mA) | Boot Time (ms) | Boot Energy (Ws) |
---|---|---|---|---|---|
linear 1.7 ms settling time | 3.26 | 3.40 | 1.70 | 2.5 | 10.06e-6 |
Very Low Power RUN Boot. Mode entered by "BOOT_HWVLPR_MODE" constant left uncommented in the
appconfig.h
configuration file.
Supply Voltage Ramp | Supply Voltage (V) | Peak Current (mA) | Mean Current (mA) | Boot Time (ms) | Boot Energy (Ws) |
---|---|---|---|---|---|
linear 1.7 ms settling time | 3.26 | 2.33 | 1.39 | 4.1 | 16.06e-6 |
In order to handle current spikes during Flash charging and Flash NVOPT fetching (when booting in RUN mode), a capacitors on VDD supply pins are required. The capacitors on VDD supply pins shall deliver current up to 6.41 mA for short duration (5 us) without significant voltage drop.