ST72E121J4D0 查看數據表（PDF） - STMicroelectronics

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ST72E121J4D0

8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

STMicroelectronics 

ST72E121 ST72T121

INTERRUPTS (Cont’d)

Figure 15. Interrupt Processing Flowchart

FROM RESET

N

BIT I SET

Y

FETCH NEXT INSTR UCTION

N

BIT I SET

Y

N

EXECU TE INSTRUCTION

IRET

Y

STACK PC, X, A, CC

SET I BIT

LOAD PC FROM INTERRUPT VECTO R

RESTORE PC, X, A, CC FROM STACK

THIS CLEARS I BIT BY DEFAULT

19/92

19

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