AT80C51RA2-RLSIV datasheet(41/85 Pages) IRF

41 / 85 page

4188E–8051–08/06

AT/TS8xC51Rx2

Table 6-16.

Priority Level Bit Values

A low-priority interrupt can be interrupted by a high priority interrupt, but not by another low-prior-

ity interrupt. A high-priority interrupt can’t be interrupted by any other interrupt source.

If two interrupt requests of different priority levels are received simultaneously, the request of

higher priority level is serviced. If interrupt requests of the same priority level are received simul-

taneously, an internal polling sequence determines which request is serviced. Thus within each

priority level there is a second priority structure determined by the polling sequence.

Table 6-17.

IE Register

IE - Interrupt Enable Register (A8h)

Reset Value = 0000 0000b

Bit addressable

IPH.x

IP.x

Interrupt Level Priority

0 (Lowest)

3 (Highest)

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 own interrupt enable bit.

6EC

PCA interrupt enable bit

Clear to disable . Set to enable.

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.

EX1

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.

EX0

External interrupt 0 Enable bit

Clear to disable external interrupt 0.

Set to enable external interrupt 0.

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