ST7PMC2M2B3 Ver la hoja de datos (PDF) - STMicroelectronics

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ST7PMC2M2B3

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

LD PFDDR,A; Write into PFDDR

LD A,#$ff

LD PFOR,A

; Write to PFOR

LD A,PFDR

AND A,#$02

LD Y,A

PxDDR

; store the level after writing to PxOR/

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

PUSH CC

.ext1_rt ; entry to interrupt routine

LD A,#$00

LD sema,A

IRET

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