Table C-13. IP Register - SFR B8h
Bit
Function
IP.7
IP.6
Reserved. Read as 1.
PS1 - Serial Port 1 interrupt priority control. PS1=0 sets
Serial Port 1 interrupt (TI_1 or RI_1) to low priority. PS1=1
sets Serial port 1 interrupt to high priority.
IP.5
IP.4
IP.3
IP.2
IP.1
IP.0
PT2 - Timer 2 interrupt priority control. PT2=0 sets Timer 2
interrupt (TF2) to low priority. PT2=1 sets Timer 2 interrupt
to high priority.
PS0 - Serial Port 0 interrupt priority control. PS0=0 sets
Serial Port 0 interrupt (TI_0 or RI_0) to low priority. PS0=1
sets Serial Port 0 interrupt to high priority.
PT2 - Timer 1 interrupt priority control. PT1 = 0 sets Timer 1
interrupt (TF1) to low priority. PT1=1 sets Timer 1 interrupt
to high priority.
PX1 - External interrupt 1 priority control. PX 1= 0 sets
external interrupt 1 (INT1) to low priority. PT1 = 1 sets
external interrupt 1 to high priority.
PT0 - Timer 0 interrupt priority control. PT0 = 0 sets Timer 0
interrupt (TF0) to low priority. PT0=1 sets Timer 0 interrupt
to high priority.
PX0 - External interrupt 0 priority control. PX0 = 0 sets
external interrupt 0 (INT0) to low priority. PX0=1 sets
external interrupt 0 to high priority.
EZ-USB TRM v1.9
Appendix C: 8051 Hardware Description
C - 29
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