T89C51RD2-3CWC-L datasheet(38/86 Pages) ATMEL

38 / 86 page

Rev. F - 15 February, 2001

T89C51RD2

Table 17. Priority Level Bit Values

A low-priority interrupt can be interrupted by a high priority interrupt, but not by another low-priority 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 simultaneously, 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 18. IE Register

IE - Interrupt Enable Register (A8h)

Reset Value = 0000 0000b

Bit addressable

IPH.x

IP.x

Interrupt Level Priority

0 (Lowest)

3 (Highest)

ET2

ET1

EX1

ET0

EX0

Bit

Number

Bit

Mnemonic

Description

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.

PCA interrupt enable bit

Clear to disable . Set to enable.

ET2

Timer 2 overﬂow interrupt Enable bit

Clear to disable timer 2 overﬂow interrupt.

Set to enable timer 2 overﬂow interrupt.

Serial port Enable bit

Clear to disable serial port interrupt.

Set to enable serial port interrupt.

ET1

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.

ET0

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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