ST72324BJ2 datasheet(181/188 Pages) STMICROELECTRONICS

Part #	ST72324BJ2

Description	8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI

PDF	188 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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181 / 188 page

ST72324B

Known limitations

181/188

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

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

ST72324BJ2 Datasheet(PDF) 181 Page - STMicroelectronics

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