Datasheet

96
T89C51AC2
4127D–8051–02/03
Table 68. IPH0 Register
IPH0 (B7h)
Interrupt High Priority Register
Reset Value = X000 0000b
76543210
- 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
01
1 0
1 1 Highest priority
5PT2H
Timer 2 Overflow Interrupt High Priority bit
PT2H
PT2 Priority Level
0 0 Lowest
0 1
10
1 1 Highest
4 PSH
Serial Port High Priority bit
PSH
PS Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
3PT1H
Timer 1 Overflow Interrupt High Priority bit
PT1H
PT1 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
2PX1H
External Interrupt 1 High Priority bit
PX1H
PX1 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
1PT0H
Timer 0 Overflow Interrupt High Priority bit
PT0H
PT0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
0PX0H
External Interrupt 0 high priority bit
PX0H
PX0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest