Rainbow Electronics T89C5115 - Manual (Page 90)

90
T89C5115
4128A–8051–04/02
Table 66. IPL0 Register
IPH0 (B7h)
Interrupt High Priority Register
Reset Value = X000 0000b
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 level most significant bit
PPCH PPC
Priority level
0 0 Lowest
0 1
1 0
1 1 Highest priority
5 PT2H
Timer 2 overflow interrupt High Priority bit
PT2H
PT2 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
4 PSH
Serial port High Priority bit
PSH PS Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
3 PT1H
Timer 1 overflow interrupt High Priority bit
PT1H
PT1 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
2 PX1H
External interrupt 1 High Priority bit
PX1H
PX1 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
1 PT0H
Timer 0 overflow interrupt High Priority bit
PT0H
PT0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
0 PX0H
External interrupt 0 high priority bit
PX0H
PX0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest