Datasheet

ManualsBrandsANALOG DEVICES ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller MQFP 52 (10x10) 8-Bit 16 MHz I/O number 34

REV. 0

ADuC831

–59–

INTERRUPT SYSTEM

The ADuC831 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

IEIP2 Secondary Interrupt Enable Register

IE Interrupt Enable Register

SFR Address A8H

Power-On Default Value 00H

Bit Addressable Yes

Table XXVIII. IE SFR Bit Designations

Bit Name Description

7EAWritten 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

4ESWritten 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

Table XXIX. 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)

4PSWritten 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)

IEIP2 Secondary Interrupt Enable Register

SFR Address A9H

Power-On Default Value A0H

Bit Addressable No

Table XXX. IEIP2 SFR Bit Designations

Bit Name Description

7 ---- Reserved for Future Use

6PTI Priority for Time Interval Interrupt

5 PPSM Priority for Power Supply Monitor Interrupt

4PSI Priority for SPI/I

C Interrupt

3 ---- This Bit Must Contain Zero

2 ETI Written by User to Enable “1” or Disable “0” Time Interval Counter Interrupt

1 EPSMI Written by User to Enable “1” or Disable “0” Power Supply Monitor Interrupt

0 ESI Written by User to Enable “1” or Disable “0” SPI/I

C Serial Port Interrupt