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C-15
REGISTERS
IPH0
Address: S:B7H
Reset State: X000 0000B
Interrupt Priority High Control Register 0. IPH0, together with IPL0, assigns each interrupt a priority
level from 0 (lowest) to 3 (highest):
IPH0.
x
IPL0.
x
Priority Level
0 0 0 (lowest priority)
011
102
1 1 3 (highest priority)
7 0
— IPH0.6 IPH0.5 IPH0.4 IPH0.3 IPH0.2 IPH0.1 IPH0.0
Bit
Number
Bit
Mnemonic
Function
7 — Reserved. The value read from this bit is indeterminate. Write a zero to
this bit.
6 IPH0.6 PCA Interrupt Priority Bit High
5 IPH0.5 Timer 2 Overflow Interrupt Priority Bit High
4 IPH0.4 Serial I/O Port Interrupt Priority Bit High
3 IPH0.3 Timer 1 Overflow Interrupt Priority Bit High
2 IPH0.2 External Interrupt 1 Priority Bit High
1 IPH0.1 Timer 0 Overflow Interrupt Priority Bit High
0 IPH0.0 External Interrupt 0 Priority Bit High