ST7MC1K2-Auto datasheet(367/371 Pages) STMICROELECTRONICS

367 / 371 page

Obsolete

Product(s)

- Obsolete

Product(s)

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

Known limitations

367/371

semaphore. If it is '1' this means that the last interrupt was missed and the interrupt routine

is invoked with the call instruction.

To implement the workaround, the following software sequence is to be followed for writing

into the PxOR/PxDDR registers. The example is for Port PF1 with falling edge interrupt

sensitivity. The software sequence is given for both cases (global interrupt

disabled/enabled).

Case 1: Writing to PxOR or PxDDR with global interrupts enabled:

LD A,#01

LD sema,A; set the semaphore to '1'

LD A,PFDR

AND A,#02

X,A; store the level before writing to PxOR/PxDDR

LD A,#$90

LD PFDDR,A; Write to PFDDR

LD A,#$ff

PFOR,A ; Write to PFOR

LD A,PFDR

AND A,#02

LD Y,A; store the level after writing to PxOR/PxDDR

LD A,X; check for falling edge

cp A,#02

jrne OUT

TNZ Y

jrne OUT

LD A,sema; check the semaphore status if edge is detected

CP A,#01

jrne OUT

call call_routine; call the interrupt routine

OUT:LD A,#00

LD sema,A

.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

Case 2: Writing to PxOR or PxDDR with global interrupts disabled:

SIM; set the interrupt mask

LD A,PFDR

AND A,#$02

X,A; store the level before writing to PxOR/PxDDR

LD A,#$90

LD PFDDR,A; Write into PFDDR

LD A,#$ff

LD PFOR,A

; Write to PFOR

LD A,PFDR

AND A,#$02

LD Y,A; store the level after writing to PxOR/PxDDR

Obsolete

Product(s)

- Obsolete

Product(s)

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