Rainbow Electronics T89C51RD2 - Manual (Page 39)

Rev. F - 15 February, 2001 39
T89C51RD2
Table 19. IP Register
IP - Interrupt Priority Register (B8h)
Reset Value = X000 0000b
Bit addressable
7 6 5 4 3 2 1 0
- PPC PT2 PS PT1 PX1 PT0 PX0
Bit
Number
Bit
Mnemonic
Description
7 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6 PPC
PCA interrupt priority bit
Refer to PPCH for priority level.
5 PT2
Timer 2 overflow interrupt Priority bit
Refer to PT2H for priority level.
4 PS
Serial port Priority bit
Refer to PSH for priority level.
3 PT1
Timer 1 overflow interrupt Priority bit
Refer to PT1H for priority level.
2 PX1
External interrupt 1 Priority bit
Refer to PX1H for priority level.
1 PT0
Timer 0 overflow interrupt Priority bit
Refer to PT0H for priority level.
0 PX0
External interrupt 0 Priority bit
Refer to PX0H for priority level.