AT89C51AC3-RDTUM datasheet(115/143 Pages) ATMEL

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115

AT89C51AC3

4383B–8051–01/05

Registers

Table 65. IEN0 Register

IEN0 (S:A8h)

Interrupt Enable Register

Reset Value = 0000 0000b

bit addressable

543

210

ET2

ET1

EX1

ET0

EX0

Bit

Number

Bit

Mnemonic Description

7EA

Enable All Interrupt bit

Clear to disable all interrupts.

Set to enable all interrupts.

If EA=1, each interrupt source is individually enabled or disabled by setting or

clearing its interrupt enable bit.

6EC

PCA Interrupt Enable

Clear to disable the PCA interrupt.

Set to enable the PCA interrupt.

5ET2

Timer 2 Overflow Interrupt Enable bit

Clear to disable Timer 2 overflow interrupt.

Set to enable Timer 2 overflow interrupt.

4ES

Serial Port Enable bit

Clear to disable serial port interrupt.

Set to enable serial port interrupt.

3ET1

Timer 1 Overflow Interrupt Enable bit

Clear to disable timer 1 overflow interrupt.

Set to enable timer 1 overflow interrupt.

2EX1

External Interrupt 1 Enable bit

Clear to disable external interrupt 1.

Set to enable external interrupt 1.

1ET0

Timer 0 Overflow Interrupt Enable bit

Clear to disable timer 0 overflow interrupt.

Set to enable timer 0 overflow interrupt.

0EX0

External Interrupt 0 Enable bit

Clear to disable external interrupt 0.

Set to enable external interrupt 0.

AT89C51AC3-RDTUM 数据表(PDF) 115 Page - ATMEL Corporation

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