STC89LE53RC datasheet(81/165 Pages) STC

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IE: Interrupt Enable Rsgister

ET2

ET1

EX1

ET0

EX0

(MSB)

(LSB)

Enable Bit = 1 enables the interrupt .

Enable Bit = 0 disables it .

Symbol

Position Function

IE.7

disables all interrupts. if EA = 0,no interrupt will be acknowledged. if

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

setting or clearing its enable bit.

ET2

IE.5

Timer 2 interrupt enable bit

IE.4

Serial Port interrupt enable bit

ET1

IE.3

Timer 1 interrupt enable bit

EX1

IE.2

External interrupt 1 enable bit

ET0

IE.1

Timer 0 interrupt enable bit

EX0

IE.0

External interrupt 0 enable bit

IP: Interrupt Priority Low Register

PT2

PT1

PX1

PT0

PX0

(MSB)

(LSB)

Priority bit = 1 assigns high priority .

Priority bit = 0 assigns low priority.

Symbol

Position

Function

PT2

IP.5

Timer 2 interrupt priority bit

IP.4

Serial Port interrupt priority bit.

PT1

IP.3

Timer 1 interrupt priority bit

PX1

IP.2

External interrupt 1 priority bit

PT0

IP.1

Timer 0 interrupt priority bit

PX0

IP.0

External interrupt 0 priority bit

IPH: Interrupt Priority High Register

LSB

bit

name

PX3H

PX2H

PT2H

PSH

PT1H

PX1H

PT0H

PX0H

PX3H : If set, Set priority for external interrupt 3 highest

PX2H : If set, Set priority for external interrupt 2 highest

PT2H : If set, Set for Timer 2 interrupt highest

PSH : If set, Set priority for serial port highest

PT1H : If set, Set priority for Timer 1 interrupt highest

PX1H : If set, Set priority for external interrupt 1 highest

PT0H : If set, Set priority for Timer 0 interrupt highest

PX0H : If set, Set priority for external interrupt 0 highest

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