Rainbow Electronics T89C51AC2 - Manual (Page 88)

88
T89C51AC2
Rev. B – 19-Dec-01
17.1 Registers Table 51. IEN0 Register
IEN0 (S:A8h)
Interrupt Enable Register
Reset Value: 0000 0000b
bit addressable
7 6 5 4 3 2 1 0
EA EC ET2 ES ET1 EX1 ET0 EX0
Bit
Number
Bit
Mnemonic Description
7 EA
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 interrupt enable bit.
6 EC
PCA Interrupt Enable
Clear to disable the PCA interrupt.
Set to enable the PCA interrupt.
5 ET2
Timer 2 overflow interrupt Enable bit
Clear to disable timer 2 overflow interrupt.
Set to enable timer 2 overflow interrupt.
4 ES
Serial port Enable bit
Clear to disable serial port interrupt.
Set to enable serial port interrupt.
3 ET1
Timer 1 overflow interrupt Enable bit
Clear to disable timer 1 overflow interrupt.
Set to enable timer 1 overflow interrupt.
2 EX1
External interrupt 1 Enable bit
Clear to disable external interrupt 1.
Set to enable external interrupt 1.
1 ET0
Timer 0 overflow interrupt Enable bit
Clear to disable timer 0 overflow interrupt.
Set to enable timer 0 overflow interrupt.
0 EX0
External interrupt 0 Enable bit
Clear to disable external interrupt 0.
Set to enable external interrupt 0.