65
AT89C51ID2
4289C–8051–11/05
Table 49. IENO Register
IEN0 - Interrupt Enable Register (A8h)
Reset Value = 0000 0000b
Bit addressable
76
543
210
EA
EC
ET2
ES
ET1
EX1
ET0
EX0
Bit
Number
Bit
Mnemonic
Description
7EA
Enable All interrupt bit
Cleared to disable all interrupts.
Set to enable all interrupts.
6EC
PCA interrupt enable bit
Cleared to disable.
Set to enable.
5ET2
Timer 2 overflow interrupt Enable bit
Cleared to disable timer 2 overflow interrupt.
Set to enable timer 2 overflow interrupt.
4ES
Serial port Enable bit
Cleared to disable serial port interrupt.
Set to enable serial port interrupt.
3ET1
Timer 1 overflow interrupt Enable bit
Cleared to disable timer 1 overflow interrupt.
Set to enable timer 1 overflow interrupt.
2
EX1
External interrupt 1 Enable bit
Cleared to disable external interrupt 1.
Set to enable external interrupt 1.
1ET0
Timer 0 overflow interrupt Enable bit
Cleared to disable timer 0 overflow interrupt.
Set to enable timer 0 overflow interrupt.
0
EX0
External interrupt 0 Enable bit
Cleared to disable external interrupt 0.
Set to enable external interrupt 0.
