STC89LE52RC datasheet(111/165 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.

IE.4

Serial Port interrupt 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

IP.4

Serial Port interrupt priority bit.

IPH: Interrupt Priority High Register

LSB

bit

name

PX3H

PX2H

PT2H

PSH

PT1H

PX1H

PT0H

PX0H

PSH : If set, Set priority for serial port highest

SADEN: Slave Address Mask register

LSB

bit

name

SADDR: Slave Address register

LSB

bit

name

SADDR register is combined with SADEN register to form Given/Broadcast Address for automatic address

recognition. In fact, SADEN function as the "mask" register for SADDR register. The following is the example

for it.

SADDR = 1100 0000

SADEN = 1111 1101

Given = 1100 00x0

The Given slave address will be checked except bit 1 is

treated as "don't care".

The Broadcast Address for each slave is created by taking the logical OR of SADDR and SADEN. Zero in this

result is considered as "don't care" and a Broad cast Address of all " don't care". This disables the automatic

address detection feature.

111

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