ST72361AR4-Auto datasheet(271/279 Pages) STMICROELECTRONICS

271 / 279 page

ST72361xx-Auto

Important notes

Doc ID 12468 Rev 3

271/279

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

LD A, X; check for falling edge

cp A, #$02

jrne OUT

TNZ Y

jrne OUT

LD A, #$01

LD sema, A; set the semaphore to '1' if edge is detected

RIM; reset the interrupt mask

LD A, sema; check the semaphore status

CP A, #$01

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

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