The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

INTERRUPT PRIORITY(cont’)

PX0

PT0

PX1

PT1

PS

PT2

--

D7 --

D0

Interrupt Priority Register (Bit-addressable)

External interrupt 0 priority bit

IP.0

PX0

Timer 0 interrupt priority bit

IP.1

PT0

External interrupt 1 priority bit

IP.2

PX1

Timer 1 interrupt priority bit

IP.3

PT1

Serial port interrupt priority bit

IP.4

PS

Timer 2 interrupt priority bit (8052 only)

IP.5

PT2

Reserved

IP.6

--

Reserved

IP.7

-- Priority bit=1 assigns high priorityPriority bit=0 assigns low priority