Table 20.) – Rainbow Electronics T89C51RD2 User Manual
Page 40
40
Rev. F - 15 February, 2001
T89C51RD2
Table 20. IPH Register
IPH - Interrupt Priority High Register (B7h)
Reset Value = X000 0000b
Not bit addressable
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 bit high.
PPCHPPC
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
5
PT2H
Timer 2 overflow interrupt Priority High bit
PT2HPT2
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
4
PSH
Serial port Priority High bit
PSHPS
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
3
PT1H
Timer 1 overflow interrupt Priority High bit
PT1HPT1
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
2
PX1H
External interrupt 1 Priority High bit
PX1HPX1
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
1
PT0H
Timer 0 overflow interrupt Priority High bit
PT0HPT0
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
0
PX0H
External interrupt 0 Priority High bit
PX0HPX0
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest