Datasheet

REV. B
ADuC824
–60–
INTERRUPT SYSTEM
The ADuC824 provides a total of twelve 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.
IEIP2: Secondary Interrupt Priority-Interrupt Register.
IE Interrupt Enable Register
SFR Address A8H
Power-On Default Value 00H
Bit Addressable Yes
AECDAE2TESE1TE1XE0TE0XE
Table XXX. 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
IP Interrupt Priority Register
SFR Address B8H
Power-On Default Value 00H
Bit Addressable Yes
— CDAP2TPSP1TP1XP0TP0XP
Table XXXI. IP SFR Bit Designations
Bit Name Description
7 — Reserved for Future Use
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)