at89c51rd2-smsum ATMEL Corporation, at89c51rd2-smsum Datasheet - Page 76

• Manufacturer Part Number: at89c51rd2-smsum
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

76
AT89C51RD2/ED2
Table 17-5.
IPH0 - Interrupt Priority High Register (B7h)
Reset Value = X000 0000b
Not bit addressable
Number
Bit
7
7
6
5
4
3
2
1
0
-
Mnemonic
IPH0 Register
PPCH
PPCH
PT2H
PT1H
PX1H
PT0H
PX0H
PSH
Bit
6
-
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
PCA interrupt Priority high bit.
PPCHPPCL Priority Level
0
0
1
1
Timer 2 overflow interrupt Priority High bit
PT2H
0
0
1
1
Serial port Priority High bit
PSH
0
0
1
1
Timer 1 overflow interrupt Priority High bit
PT1H
0
0
1
1
External interrupt 1 Priority High bit
PX1H
0
0
1
1
Timer 0 overflow interrupt Priority High bit
PT0H
0
0
1
1
External interrupt 0 Priority High bit
PX0H
0
0
1
1
PT2H
0 Lowest
1
0
1 Highest
5
PT2L
0
1
0
1
PSL
0
1
0
1
PT1L
0
1
0
1
PX1L
0
1
0
1
PT0L
0
1
0
1
PX0L
0
1
0
1
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
PSH
4
PT1H
3
PX1H
2
PT0H
1
4235J–8051–01/08
PX0H
0