ST72321BXXX-AUTO View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72321BXXX-AUTO

8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

STMicroelectronics 

Known limitations

ST72321Bxxx-Auto

jrne OUT

call call_routine

; call the interrupt routine

RIM

OUT:

RIM

JP while_loop

.call_routine

; entry to call_routine

PUSH A

PUSH X

PUSH CC

.ext1_rt

; entry to interrupt routine

LD A,#$00

LD sema,A

IRET

22.1.3

Note:

Clearing active interrupts outside interrupt routine

When an active interrupt request occurs at the same time as the related flag is being

cleared, an unwanted reset may occur.

Clearing the related interrupt mask will not generate an unwanted reset.

Concurrent interrupt context

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

● The interrupt flag is cleared within its own interrupt routine

● The interrupt flag is cleared within any interrupt routine

● The interrupt flag is cleared 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 interrupt flag

RIM

Nested interrupt context

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