AT89C51ED2-SMRUM Datasheet, PDF (74/137 Pages) ATMEL Corporation – 8-bit Flash Microcontroller

Table 17-3. IENO Register
IEN0 - Interrupt Enable Register (A8h)
7
6
5
4
3
2
1
0
EA
EC
ET2
ES
ET1
EX1
ET0
EX0
Bit
Number
7
6
5
4
3
2
1
0
Bit
Mnemonic Description
Enable All interrupt bit
EA
Cleared to disable all interrupts.
Set to enable all interrupts.
PCA interrupt enable bit
EC
Cleared to disable.
Set to enable.
Timer 2 overflow interrupt Enable bit
ET2
Cleared to disable timer 2 overflow interrupt.
Set to enable timer 2 overflow interrupt.
Serial port Enable bit
ES
Cleared to disable serial port interrupt.
Set to enable serial port interrupt.
Timer 1 overflow interrupt Enable bit
ET1
Cleared to disable timer 1 overflow interrupt.
Set to enable timer 1 overflow interrupt.
External interrupt 1 Enable bit
EX1
Cleared to disable external interrupt 1.
Set to enable external interrupt 1.
Timer 0 overflow interrupt Enable bit
ET0
Cleared to disable timer 0 overflow interrupt.
Set to enable timer 0 overflow interrupt.
External interrupt 0 Enable bit
EX0
Cleared to disable external interrupt 0.
Set to enable external interrupt 0.
Reset Value = 0000 0000b
Bit addressable
74 AT89C51RD2/ED2
4235K–8051–05/08