ST72104GX datasheet(26/141 Pages) STMICROELECTRONICS

Part #	ST72104GX

Description	8-bit data manipulation

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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ST72104Gx, ST72215Gx, ST72216Gx, ST72254Gx

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INTERRUPTS (Cont’d)

Figure 15. Interrupt Processing Flowchart

Table 5. Interrupt Mapping

Note

1. Configurable by option byte.

N°

Source

Block

Description

Register

Label

Priority

Order

Exit

from

HALT

Address

Vector

RESET

Reset

N/A

Highest

Priority

Lowest

Priority

yes

FFFEh-FFFFh

TRAP

Software Interrupt

no

FFFCh-FFFDh

0

ei0

External Interrupt Port A7..0 (C5..01)

yes

FFFAh-FFFBh

1

ei1

External Interrupt Port B7..0 (C5..01)

FFF8h-FFF9h

2

CSS

Clock Security System Interrupt

CRSR

no

FFF6h-FFF7h

3

SPI

SPI Peripheral Interrupts

SPISR

FFF4h-FFF5h

4

TIMER A

TIMER A Peripheral Interrupts

TASR

FFF2h-FFF3h

5

Not used

FFF0h-FFF1h

6

TIMER B

TIMER B Peripheral Interrupts

TBSR

no

FFEEh-FFEFh

7

Not used

FFECh-FFEDh

8

Not used

FFEAh-FFEBh

9

Not used

FFE8h-FFE9h

10

Not used

FFE6h-FFE7h

11

I²C

I²C Peripheral Interrupt

I2CSRx

no

FFE4h-FFE5h

12

Not Used

FFE2h-FFE3h

13

Not Used

FFE0h-FFE1h

I BIT SET?

Y

N

IRET?

Y

N

FROM RESET

LOAD PC FROM INTERRUPT VECTOR

STACK PC, X, A, CC

SET I BIT

FETCH NEXT INSTRUCTION

EXECUTE INSTRUCTION

THIS CLEARS I BIT BY DEFAULT

RESTORE PC, X, A, CC FROM STACK

INTERRUPT

Y

N

PENDING?

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