ST7MC1K2-Auto datasheet(362/371 Pages) STMICROELECTRONICS

362 / 371 page

Obsolete

Product(s)

- Obsolete

Product(s)

Known limitations

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

362/371

Concurrent interrupt context

The symptom does not occur when the interrupts are handled normally, that is, when:

●

The interrupt request is cleared (flag reset or interrupt mask) within its own interrupt

routine

●

The interrupt request is cleared (flag reset or interrupt mask) within any interrupt

routine

●

The interrupt request is cleared (flag reset or interrupt mask) in any part of the code

while this interrupt is disabled

If these conditions are not met, the symptom can be avoided by implementing the following

sequence:

Perform SIM and RIM operation before and after resetting an active interrupt request

Example:

SIM

Reset flag or interrupt mask

RIM

Nested interrupt context

The symptom does not occur when the interrupts are handled normally, that is, when:

●

The interrupt request is cleared (flag reset or interrupt mask) within its own interrupt

routine.

●

The interrupt request is cleared (flag reset or interrupt mask) within any interrupt

routine with higher or identical priority level.

●

The interrupt request is cleared (flag reset or interrupt mask) in any part of the code

while this interrupt is disabled.

If these conditions are not met, the symptom can be avoided by implementing the following

sequence:

Push CC

SIM

Reset flag or interrupt mask

Pop CC

15.3

TIMD set simultaneously with OC interrupt

If the 16-bit timer is disabled at the same time as the output compare event occurs then the

output compare flag gets locked and cannot be cleared before the timer is enabled again.

15.3.1

Impact on the application

If the output compare interrupt is enabled, then the output compare flag cannot be cleared

in the timer interrupt routine. Consequently the interrupt service routine is called repeatedly

and the application gets stuck which causes the watchdog reset if enabled by the

application.

Obsolete

Product(s)

- Obsolete

Product(s)

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