ST7L15 datasheet(32/138 Pages) STMICROELECTRONICS

32 / 138 page

ST7L15, ST7L19

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INTERRUPTS (cont’d)

Figure 18. Interrupt Processing Flowchart

Table 5. Interrupt Mapping

Notes:

1. This interrupt exits the MCU from “Auto Wake-Up from Halt” mode only.

2. These interrupts exit the MCU from “ACTIVE HALT” mode only.

No.

Source

Block

Description

Label

Priority

Order

Exit

from

HALT or

AWUFH

Address

Vector

RESET

Reset

Highest

Priority

Lowest

Priority

yes

FFFEh-FFFFh

TRAP

Software Interrupt

FFFCh-FFFDh

AWU

Auto Wake-Up Interrupt

AWUCSR

yes1)

FFFAh-FFFBh

ei0

External Interrupt 0

-yes

FFF8h-FFF9h

ei1

External Interrupt 1

FFF6h-FFF7h

ei2

External Interrupt 2

FFF4h-FFF5h

ei3

External Interrupt 3

FFF2h-FFF3h

LITE TIMER

LITE TIMER RTC2 interrupt

LTCSR2

FFF0h-FFF1h

Not used

FFEEh-FFEFh

Not used

FFECh-FFEDh

AT TIMER

AT TIMER Output Compare Interrupt

or Input Capture Interrupt

PWMxCSR

or ATCSR

FFEAh-FFEBh

AT TIMER Overflow Interrupt

ATCSR

yes2)

FFE8h-FFE9h

LITE TIMER

LITE TIMER Input Capture Interrupt

LTCSR

FFE6h-FFE7h

LITE TIMER RTC1 Interrupt

LTCSR

yes2)

FFE4h-FFE5h

SPI

SPI Peripheral Interrupts

SPICSR

yes

FFE2h-FFE3h

AT TIMER

AT TIMER Overflow Interrupt

ATCSR2

FFE0h-FFE1h

I BIT SET?

IRET?

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

PENDING?

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