AT89LP51RB2 datasheet(63/254 Pages) ATMEL

63 / 254 page

3722A–MICRO–10/11

AT89LP51RB2/RC2/IC2 Preliminary

9.3

Interrupt Registers

Table 9-3.

IEN0 – Interrupt Enable Register 0

IEN0 = A8H

Reset Value = 0000 0000B

Bit Addressable

ET2

ET1

EX1

ET0

EX0

Bit

543

Symbol

Function

Global Interrupt Enable

All interrupts are disabled when EA = 0. When EA = 1, each interrupt source is enabled/disabled by setting /clearing its own enable bit.

PCA Interrupt Enable

Clear to disable the PCA interrupt. Set to enable the PCA interrupt when EA = 1.

ET2

Timer 2 Interrupt Enable

Clear to disable the Timer 2 interrupt. Set to enable the Timer 2 interrupt when EA = 1.

Serial Port Interrupt Enable

Clear to disable the UART interrupt. Set to enable the UART interrupt when EA = 1.

ET1

Timer 1 Interrupt Enable

Clear to disable the Timer 1 interrupt. Set to enable the Timer 1 interrupt when EA = 1.

EX1

External Interrupt 1 Enable.

Clear to disable the INT1 interrupt. Set to enable the INT1 interrupt when EA = 1.

ET0

Timer 0 Interrupt Enable

Clear to disable the Timer 0 interrupt. Set to enable the Timer 0 interrupt when EA = 1.

EX0

External Interrupt 0 Enable

Clear to disable the INT0 interrupt. Set to enable the INT0 interrupt when EA = 1.

Table 9-4.

IEN1 – Interrupt Enable Register 1

IEN1 = B1H

Reset Value = 0000 0000B

Bit Addressable

–

EADC

ECMP

–

ESPI

ETWI

EKBD

Bit

543

Symbol

Function

EADC

ADC Interrupt Enable.

Clear to disable the ADC interrupt. Set to enable the ADC interrupt when EA = 1.

ECMP

Analog COmparator Interrupt Enable

Clear to disable the Analog Comparator interrupt. Set to enable the Analog Comparator interrupt when EA = 1.

ESPI

SPI Interrupt Enable

Clear to disable the SPI interrupt. Set to enable the SPI interrupt when EA = 1.

ETWI

TWI Interrupt Enable

Clear to disable the TWI interrupt. Set to enable the TWI interrupt when EA = 1.

EKBD

Keyboard Interrupt Enable

Clear to disable the Keyboard interrupt. Set to enable the Keyboard interrupt when EA = 1.

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