ST7PLITEU09M3TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7PLITEU09M3TR

8-bit MCU with single voltage Flash memory, ADC, timers

STMicroelectronics 

ST7LITEU05 ST7LITEU09

INTERRUPTS (cont’d)

Figure 18. Interrupt Processing Flowchart

FROM RESET

N

I BIT SET?

Y

FETCH NEXT INSTRUCTION

N

INTERRUPT

PENDING?

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 10. Interrupt mapping

N°

Source

Block

Description

Register

Label

Priority

Order

Exit

from

HALT

Address

Vector

RESET Reset

TRAP Software Interrupt

0

AWU Auto Wakeup Interrupt

N/A

AWUCSR

Highest

Priority

yes

no

yes 1)

FFFEh-FFFFh

FFFCh-FFFDh

FFFAh-FFFBh

1

ei0

External Interrupt 0

FFF8h-FFF9h

2

ei1

External Interrupt 1

3 2)

ei2 2)

External Interrupt 22)

4

Not used

yes FFF6h-FFF7h

FFF4h-FFF5h

N/A

no FFF2h-FFF3h

5

ei3

External Interrupt 3

6 3)

ei4 3)

External Interrupt 4 3)

yes FFF0h-FFF1h

no 3) FFEEh-FFEFh

7

SI

AVD interrupt

SICSR

no FFECh-FFEDh

8

AT TIMER Output Compare Interrupt PWMxCSR or ATCSR

AT TIMER

9

AT TIMER Overflow Interrupt

ATCSR

no FFEAh-FFEBh

yes 4) FFE8h-FFE9h

10

LITE TIMER Input Capture Interrupt

LITE TIMER

11

LITE TIMER RTC1 Interrupt

LTCSR

LTCSR

no FFE6h-FFE7h

yes 4) FFE4h-FFE5h

12

Not used

13

Not used

Lowest

Priority

no FFE2h-FFE3h

no FFE0h-FFE1h

Notes:

1. This interrupt exits the MCU from “Auto Wake-up from HALT” mode only.

2. Whatever the sensitivity configuration, this interrupt cannot exit the MCU from HALT, ACTIVE-HALT and AWUFH

modes when a falling edge occurs.

3. This interrupt exits the MCU from “WAIT” and “ACTIVE-HALT” modes only. Moreover IS4[1:0] =01 is the only safe con-

figuration to avoid spurious interrupt in Halt and AWUFH modes.

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

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