ST72E633K1M1 查看數據表（PDF） - STMicroelectronics

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ST72E633K1M1

LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C

STMicroelectronics 

ST7263

INTERRUPTS (Cont’d)

Figure 15. Interrupt Processing Flowchart

FROM RESET

BIT I SET

N

Y

FETCH NEXT INSTRUCTION

N

INTERRUPT

Y

N

EXECUTE INSTRUCTION

IRET

Y

STACK PC, X, A, CC

SET I BIT

LOAD PC FROM INTERRUPT VECTOR

RESTORE PC, X, A, CC FROM STACK

THIS CLEARS I BIT BY DEFAULT

Table 7. Interrupt Mapping

N°

Source

Block

Description

RESET Reset

TRAP

Software Interrupt

USB

End Suspend Mode

1

ITi

External Interrupts

2

TIMER

Timer Peripheral Interrupts

3

I2C

I2C Peripheral Interrupts

4

SCI

SCI Peripheral Interrupts

5

USB

USB Peripheral Interrupts

Register

Label

Priority

Order

Exit

from

HALT

Highest yes

N/A

Priority no

ISTR

yes

ITRFRE

TIMSR

I2CSR1

I2CSR2

no

SCISR Lowest

ISTR

Priority

Vector

Address

FFFEh-FFFFh

FFFCh-FFFDh

FFFAh-FFFBh

FFF8h-FFF9h

FFF6h-FFF7h

FFF4h-FFF5h

FFF2h-FFF3h

FFF0h-FFF1h

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