Table 67) – Rainbow Electronics AT89C5131 User Manual
Page 94
94
AT89C5131
4136A–USB–03/03
Table 67. IPH0 Register
IPH0 - 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 high bit.
PPCH PPCL
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
5
PT2H
Timer 2 overflow interrupt Priority High bit
PT2H
PT2L
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
4
PSH
Serial port Priority High bit
PSH
PSL
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
3
PT1H
Timer 1 overflow interrupt Priority High bit
PT1H
PT1L
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
2
PX1H
External interrupt 1 Priority High bit
PX1H
PX1L
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
1
PT0H
Timer 0 overflow interrupt Priority High bit
PT0H
PT0L
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest
0
PX0H
External interrupt 0 Priority High bit
PX0H
PX0L
Priority Level
0
0
Lowest
0
1
1
0
1
1
Highest