Rainbow Electronics T89C5115 User Manual
Page 90
90
T89C5115
4128A–8051–04/02
Table 66. IPL0 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