
166
AT89C51CC03
4182O–CAN–09/08
Table 114. IPL0 Register
IPH0 (B7h)
Interrupt High Priority Register
Reset Value = X000 0000b
7654
3210
-
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
Lowest
0
1
0
1
Highest priority
5PT2H
Timer 2 Overflow Interrupt High Priority bit
PT2H PT2
Priority Level
0
Lowest
0
1
0
1
Highest
4
PSH
Serial Port High Priority bit
PSH
PS
Priority Level
0
Lowest
0
1
0
1
Highest
3PT1H
Timer 1 Overflow Interrupt High Priority bit
PT1H PT1
Priority Level
0
Lowest
0
1
0
1
Highest
2PX1H
External Interrupt 1 High Priority bit
PX1H PX1
Priority Level
0
Lowest
0
1
0
1
Highest
1PT0H
Timer 0 Overflow Interrupt High Priority bit
PT0H PT0
Priority Level
0
Lowest
0
1
0
1
Highest
0PX0H
External Interrupt 0 high priority bit
PX0H PX0
Priority Level
0
Lowest
0
1
0
1
Highest