Datasheet

REV.

ADuC812

–38–

INTERRUPT SYSTEM

The ADuC812 provides a total of nine interrupt sources with two priority levels. The control and configuration of the interrupt system

is carried out through three interrupt related SFRs.

IE Interrupt Enable Register

IP Interrupt Priority Register

IE2 Secondary Interrupt Enable Register

Interrupt Enable

IE Register

SFR Address A8H

Power-On Default Value 00H

Bit Addressable Yes

AECDAE2TESE1TE1XE0TE0XE

Table XXII. IE SFR Bit Designations

Bit Name Description

7 EA Written by user to enable “1” or disable “0” all interrupt sources.

6 EADC Written by user to enable “1” or disable “0” ADC interrupt.

5 ET2 Written by user to enable “1” or disable “0” Timer 2 interrupt.

4 ES Written by user to enable “1” or disable “0” UART serial port interrupt.

3 ET1 Written by user to enable “1” or disable “0” Timer 1 interrupt.

2 EX1 Written by user to enable “1” or disable “0” External Interrupt 1.

1 ET0 Written by user to enable “1” or disable “0” Timer 0 interrupt.

0 EX0 Written by user to enable “1” or disable “0” External Interrupt 0.

Interrupt Priority

IP Register

SFR Address B8H

Power-On Default Value 00H

Bit Addressable Yes

ISPCDAP2TPSP1TP1XP0TP0XP

Table XXIII. IP SFR Bit Designations

Bit Name Description

7 PSI Written by user to select I

C/SPI priority (“1” = High; “0” = Low).

6 PADC Written by user to select ADC interrupt priority (“1” = High; “0” = Low).

5 PT2 Written by user to select Timer 2 interrupt priority (“1” = High; “0” = Low).

4 PS Written by user to select UART serial port interrupt priority (“1” = High; “0” = Low).

3 PT1 Written by user to select Timer 1 interrupt priority (“1” = High; “0” = Low).

2 PX1 Written by user to select External Interrupt 1 priority (“1” = High; “0” = Low).

1 PT0 Written by user to select Timer 0 interrupt priority (“1” = High; “0” = Low).

0 PX0 Written by user to select External Interrupt 0 priority (“1” = High; “0” = Low).