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20
4428E–8051–02/08
AT/TS80C31X2
Table 10-4.
IPH Register -- IPH - Interrupt Priority High Register (B7h)
Reset Value = XXX0 0000b
Not bit addressable
7
6
5
4
3
2
1
0
-
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
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
PSH
Serial port Priority High bit
PSH
PS
Priority Level
0
Lowest
0
1
0
1
Highest
3
PT1H
Timer 1 overflow interrupt Priority High bit
PT1H
PT1 Priority Level
0
Lowest
0
1
0
1
Highest
2
PX1H
External interrupt 1 Priority High bit
PX1H
PX1 Priority Level
0
Lowest
0
1
0
1
Highest
1
PT0H
Timer 0 overflow interrupt Priority High bit
PT0H
PT0 Priority Level
0
Lowest
0
1
0
1
Highest
0
PX0H
External interrupt 0 Priority High bit
PX0H
PX0 Priority Level
0
Lowest
0
1
0
1
Highest
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