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ST72325AR7-Auto Datasheet(PDF) 237 Page - STMicroelectronics |
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ST72325AR7-Auto Datasheet(HTML) 237 Page - STMicroelectronics |
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237 / 243 page  Obsolete Product(s) - Obsolete Product(s) ST72325xxx-Auto Known limitations Doc ID 13770 Rev 3 237/243 LD sema,A ; set the semaphore to '1' LD A,PFDR AND A,#02 LD X,A ; store the level before writing to PxOR/PxDDR LD A,#$90 LD PFDDR,A ; Write to PFDDR LD A,#$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,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 |
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