Chapter 11 INTERRUPTS PROGRAMMING

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Presentation transcript:

Chapter 11 INTERRUPTS PROGRAMMING 2002/2/27 Microcomputers and Microprocessors

Outlines Contrast and compare interrupts versus polling Explain the purpose of the ISR List the 6 interrupts of the 8051 Explain the purpose of the interrupt vector table Enable or disable 8051 interrupts Program the 8051 timers using interrupts Describe the two external hardware interrupts of the 8051

Contrast edge-triggered with level-triggered interrupts Program the 8051 for interrupt-based serial communication Define the interrupt priority of the 8051

Six interrupts in the 8051

Step in enabling an interrupt

PROGRAMMING TIMER INTERRUPTS

Roll-over timer flag and interrupt JNB TF, target

Programming external hardware interrupts

Sampling the low level-triggered interrupt

Edge-triggered interrupts

Sampling the edge-triggered interrupt

RI and TI flags and interrupts

Use of serial COM in the 8051

Clearing RI and TI before the RETI instruction CLR TI ; CLR RI

Interrupt priority upon reset

Setting interrupt priority with the IP register