Rainbow Electronics T89C5121 - Manual (Page 55)

55
A/T8xC5121
4164G–SCR–07/06
Table 38. IPH0 Register
Reset Value = XXX0 0000b
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 0 Lowest
0 1
1 0
1 1 Highest
3 PT1H
Timer 1 overflow interrupt Priority High bit
PT1H PT1 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
2 PX1H
External interrupt 1 Priority High bit
PX1H PX1 Priority Level
0
0 Lowest
0 1
1 0
1 1 Highest
1 PT0H
Timer 0 overflow interrupt Priority High bit
PT0H PT0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
0 PX0H
External interrupt 0 Priority High bit
PX0 HPX0 Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest