Datasheet

142
A/T89C51CC01
4129N–CAN–03/08
Table 119. IPH0 Register
IPH0 (B7h)
Interrupt High Priority Register
Reset Value = X000 0000b
7 6 5 4 3 2 1 0
- PPCH PT2H PSH PT1H PX1H PT0H PX0H
Bit
Number
Bit
Mnemonic Description
7 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6 PPCH
PCA Interrupt Priority Level Most Significant bit
PPCH PPC Priority level
0 0 Lowest
0 1
1 0
1 1 Highest priority
5 PT2H
Timer 2 Overflow Interrupt High Priority bit
PT2H PT2 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
4 PSH
Serial Port High Priority bit
PSH PS Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
3 PT1H
Timer 1 Overflow Interrupt High Priority bit
PT1H PT1 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
2 PX1H
External Interrupt 1 High Priority bit
PX1H PX1 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
1 PT0H
Timer 0 Overflow Interrupt High Priority bit
PT0H PT0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
0 PX0H
External Interrupt 0 high priority bit
PX0H PX0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest