UMBC CMSC 391 -- Programming Microcontrollers  

Interrupt Enable (IE) Special Function Register

Bit Symbol IE Bit Function
7 EA Enable Interrupts bit. Cleared to 0 by program to disable all interrupts; set to 1 to permit individual interrupts to be enabled by their enable bits.
6 -- Not implemented.
5 ET2 Reserved for future use.
4 ES Enable serial port interrupt. Set to 1 by program to enable serial port interrupt; cleared to 0 to disable serial port interrupt.
3 ET1 Enable timer 1 overflow interrupt. Set to 1 by program to enable timer 1 overflow interrupt; cleared to 0 to disable timer 1 overflow interrupt.
2 EX1 Enable external interrupt 1. Set to 1 by program to enable INT1 interrupt; cleared to 0 to disable INT1 interrupt.
1 ET0 Enable timer 0 overflow interrupt. Set to 1 by program to enable timer 0 overflow interrupt; cleared to 0 to disable timer 0 overflow interrupt.
0 EX1 nable external interrupt 0. Set to 1 by program to enable INT0 interrupt; cleared to 0 to disable INT0 interrupt.

IE is bit addressable.
Direct Byte Address is 0A8h.

©2004, Gary L. Burt