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8XC251SA, SB, SP, SQ USER’S MANUAL
C-14
IE0
Address: S:A8H
Reset State: 0000 0000B
Interrupt Enable Register 0. IE0 contains two types of interrupt enable bits. The global enable bit (EA)
enables/disables all of the interrupts, except the TRAP interrupt, which is always enabled. The
remaining bits enable/disable the other individual interrupts.
7 0
EA EC ET2 ES ET1 EX1 ET0 EX0
Bit
Number
Bit
Mnemonic
Function
7 EA Global Interrupt Enable:
Setting this bit enables all interrupts that are individually enabled by bits
0–6. Clearing this bit disables all interrupts, except the TRAP interrupt,
which is always enabled.
6 EC PCA Interrupt Enable:
Setting this bit enables the PCA interrupt.
5 ET2 Timer 2 Overflow Interrupt Enable:
Setting this bit enables the timer 2 overflow interrupt.
4 ES Serial I/O Port Interrupt Enable:
Setting this bit enables the serial I/O port interrupt.
3 ET1 Timer 1 Overflow Interrupt Enable:
Setting this bit enables the timer 1 overflow interrupt.
2 EX1 External Interrupt 1 Enable:
Setting this bit enables external interrupt 1.
1 ET0 Timer 0 Overflow Interrupt Enable:
Setting this bit enables the timer 0 overflow interrupt.
0 EX0 External Interrupt 0 Enable:
Setting this bit enables external interrupt 0.