AT89LP428 datasheet(32/149 Pages) ATMEL

32 / 149 page

3654A–MICRO–8/09

AT89LP428/828

9.2

Interrupt Registers

Table 9-2.

IE – Interrupt Enable Register

IE = A8H

Reset Value = 0000 0000B

Bit Addressable

ET2

ET1

EX1

ET0

EX0

Bit

7654

3210

Symbol

Function

Global enable/disable. All interrupts are disabled when EA = 0. When EA = 1, each interrupt source is

enabled/disabled by setting/clearing its own enable bit.

Comparator Interrupt Enable

ET2

Timer 2 Interrupt Enable

ESSerial Port Interrupt Enable

ET1

Timer 1 Interrupt Enable

EX1

External Interrupt 1 Enable

ET0

Timer 0 Interrupt Enable

EX0

External Interrupt 0 Enable

Table 9-3.

IP – Interrupt Priority Register

IP = B8H

Reset Value = 0000 0000B

Bit Addressable

IP0D

PT2

PT1

PX1

PT0

PX0

Bit

7654

3210

Symbol

Function

IP0D

Interrupt Priority 0 Disable. Set IP0D to 1 to disable all interrupts with priority level zero. Clear to 0 to enable all interrupts

with priority level zero when EA = 1.

Comparator Interrupt Priority Low

PT2

Timer 2 Interrupt Priority Low

PSSerial Port Interrupt Priority Low

PT1

Timer 1 Interrupt Priority Low

PX1

External Interrupt 1 Priority Low

PT0

Timer 0 Interrupt Priority Low

PX0

External Interrupt 0 Priority Low

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