Datasheet

ManualsBrandsANALOG DEVICES ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller LFCSP 56 VQ (8x8) 8-Bit 12.58 MHz I/O number 34

REV. A

ADuC834

–61–

INTERRUPT SYSTEM

The ADuC834 provides a total of 11 interrupt sources with two priority levels. The control and configuration of the interrupt system

is carried out through three interrupt-related SFRs. These are the IE (Interrupt Enable) Register, the IP (Interrupt Priority Register)

and the IEIP2 (Secondary Interrupt Enable/Priority SFR) Registers. Their bit definitions are given in the Tables XXXV – XXXVII.

IE Interrupt Enable Register

SFR Address A8H

Power-On Default Value 00H

Bit Addressable Yes

Table XXXV. 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 XXXVI. 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 and Priority Register

SFR Address A9H

Power-On Default Value A0H

Bit Addressable No

Table XXXVII. IEIP2 SFR Bit Designations

Bit Name Description

7 ––– Reserved for Future Use

6PTI Written by User to Select TIC Interrupt Priority (‘1’ = High; ‘0’ = Low)

5 PPSM Written by User to Select Power Supply Monitor Interrupt Priority (‘1’ = High; ‘0’ = Low)

4PSI Written by User to Select SPI/I

C Serial Port Interrupt Priority (‘1’ = High; ‘0’ = Low)

3 ––– Reserved. This Bit Must Be ‘0.’

2 ETI Written by User to Enable ‘1’ or Disable ‘0’ TIC Interrupt

1EPSM 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