Rainbow Electronics AT89C5132 - Manual (Page 40)

40
AT8xC5132
4173A–8051–08/02
Registers Table 50. IEN0 Register
IEN0 (S:A8h) – Interrupt Enable Register 0
Reset Value = 0000 0000b
7 6 5 4 3 2 1 0
EA EAUD – ES ET1 EX1 ET0 EX0
Bit
Number
Bit
Mnemonic Description
7 EA
Enable All Interrupt Bit
Set to enable all interrupts.
Clear to disable all interrupts.
If EA = 1, each interrupt source is individually enabled or disabled by setting or
clearing its interrupt enable bit.
6 EAUD
Audio Interface Interrupt Enable Bit
Set to enable audio interface interrupt.
Clear to disable audio interface interrupt.
5 –
Reserved
The values read from this bit is always 0. Do not set this bit.
4 ES
Serial Port Interrupt Enable Bit
Set to enable serial port interrupt.
Clear to disable serial port interrupt.
3 ET1
Timer 1 Overflow Interrupt Enable Bit
Set to enable Timer 1 overflow interrupt.
Clear to disable Timer 1 overflow interrupt.
2 EX1
External Interrupt 1 Enable bit
Set to enable external interrupt 1.
Clear to disable external interrupt 1.
1 ET0
Timer 0 Overflow Interrupt Enable Bit
Set to enable timer 0 overflow interrupt.
Clear to disable timer 0 overflow interrupt.
0 EX0
External Interrupt 0 Enable Bit
Set to enable external interrupt 0.
Clear to disable external interrupt 0.