AT89S2051 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89S2051 Datasheet PDF : 45 Pages
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AT89S2051/S4051
14. Interrupt Registers
Table 14-1. IE – Interrupt Enable Register
IE = A8H
Bit Addressable
EA
EC
–
Bit
7
6
5
Reset Value = 00X0 0000B
ES
ET1
EX1
ET0
EX0
4
3
2
1
0
Symbol
EA
EC
ES
ET1
EX1
ET0
EX0
Function
Global enable/disable. All interrupts are disabled when EA = 0. When EA = 1, each interrupt source is enabled/disabled
by setting/clearing its own enable bit.
Comparator Interrupt Enable
Serial Port Interrupt Enable
Timer 1 Interrupt Enable
External Interrupt 1 Enable
Timer 0 Interrupt Enable
External Interrupt 0 Enable
.
Table 14-2. IP – Interrupt Priority Register
IP = B8H
Bit Addressable
–
PC
–
Bit
7
6
5
Reset Value = X0X0 0000B
PS
PT1
PX1
PT0
PX0
4
3
2
1
0
Symbol
PC
PS
PT1
PX1
PT0
PX0
Function
Comparator Interrupt Priority Low
Serial Port Interrupt Priority Low
Timer 1 Interrupt Priority Low
External Interrupt 1 Priority Low
Timer 0 Interrupt Priority Low
External Interrupt 0 Priority Low
.
Table 14-3. IPH – Interrupt Priority High Register
IPH = B7H
Not Bit Addressable
–
PCH
–
PSH
Bit
7
6
5
4
PT1H
3
Reset Value = X0X0 0000B
PX1H
2
PT0H
1
PX0H
0
Symbol
PCH
PSH
PT1H
PX1H
PT0H
PX0H
Function
Comparator Interrupt Priority High
Serial Port Interrupt Priority High
Timer 1 Interrupt Priority High
External Interrupt 1 Priority High
Timer 0 Interrupt Priority High
External Interrupt 0 Priority High
13
3390C–MICRO–7/05
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