Datasheet

59
AT89C51RB2/RC2
4180E–8051–10/06
Table 46. IPH0 Register
IPH0 - Interrupt Priority High Register (B7h)
Reset Value = X000 0000b
Not bit addressable
76543210
- 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
00Lowest
01
10
1 1 Highest
5PT2H
Timer 2 Overflow Interrupt Priority High Bit
PT2H
PT2L Priority Level
00Lowest
01
10
1 1 Highest
4 PSH
Serial Port Priority High Bit
PSH
PSL Priority Level
00Lowest
01
10
1 1 Highest
3PT1H
Timer 1 Overflow Interrupt Priority High Bit
PT1H
PT1L Priority Level
00Lowest
01
10
1 1 Highest
2 PX1H
External Interrupt 1 Priority High Bit
PX1H
PX1L Priority Level
00Lowest
01
10
1 1 Highest
1PT0H
Timer 0 Overflow Interrupt Priority High Bit
PT0H
PT0L Priority Level
00Lowest
01
10
1 1 Highest
0 PX0H
External Interrupt 0 Priority High Bit
PX0H
PX0L Priority Level
00Lowest
01
10
1 1 Highest