ST72F324J2TCRE データシートの表示（PDF） - STMicroelectronics

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ST72F324J2TCRE

8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI

STMicroelectronics 

Power saving modes

ST72324xx-Auto

Halt mode recommendations

● Make sure that an external event is available to wake up the microcontroller from Halt

mode.

● When using an external interrupt to wake up the microcontroller, reinitialize the

corresponding I/O as “Input Pull-up with Interrupt” before executing the HALT

instruction. The main reason for this is that the I/O may be wrongly configured due to

external interference or by an unforeseen logical condition.

● For the same reason, reinitialize the sensitivity level of each external interrupt as a

precautionary measure.

● The opcode for the HALT instruction is 0x8E. To avoid an unexpected HALT instruction

due to a program counter failure, it is advised to clear all occurrences of the data value

0x8E from memory. For example, avoid defining a constant in ROM with the value

) 0x8E.

t(s ● As the HALT instruction clears the interrupt mask in the CC register to allow interrupts,

c the user may choose to clear all pending interrupt bits before executing the HALT

u instruction. This avoids entering other peripheral interrupt routines after executing the

d external interrupt routine corresponding to the wake-up event (reset or external

Obsolete Product(s) - Obsolete Pro interrupt).

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Doc ID 13841 Rev 1

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