Tài liệu Chapter 11: INTERRUPTS PROGRAMMING docx

02/03/14
02/03/14
Microcomputers and Microprocessors
Microcomputers and Microprocessors
NATIONAL TAIWAN
NATIONAL TAIWAN
OCEAN UNIVERSITY
OCEAN UNIVERSITY
國國國國國國國 國
國國國國國國國 國
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2002 MuDer Jeng
2002 MuDer Jeng
Chapter 11
Chapter 11
INTERRUPTS
INTERRUPTS
PROGRAMMING
PROGRAMMING

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2002 MuDer Jeng
Outlines
Outlines
♦
Contrast and compare interrupts versus polling
Contrast and compare interrupts versus polling
♦

Explain the purpose of the ISR
Explain the purpose of the ISR
♦
List the 6 interrupts of the 8051
List the 6 interrupts of the 8051
♦
Explain the purpose of the interrupt vector table
Explain the purpose of the interrupt vector table
♦
Enable or disable 8051 interrupts
Enable or disable 8051 interrupts
♦
Program the 8051 timers using interrupts
Program the 8051 timers using interrupts
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Describe the two external hardware interrupts of
Describe the two external hardware interrupts of
the 8051
the 8051

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2002 MuDer Jeng
♦
Contrast edge-triggered with level-triggered
Contrast edge-triggered with level-triggered
interrupts
interrupts
♦

Program the 8051 for interrupt-based serial
Program the 8051 for interrupt-based serial
communication
communication
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Define the interrupt priority of the 8051
Define the interrupt priority of the 8051

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Six interrupts in the 8051
Six interrupts in the 8051

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Step in enabling an interrupt
Step in enabling an interrupt

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PROGRAMMING TIMER
PROGRAMMING TIMER
INTERRUPTS
INTERRUPTS

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Roll-over timer flag and interrupt
Roll-over timer flag and interrupt
JNB TF, target

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Programming external hardware
Programming external hardware
interrupts
interrupts

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Sampling the low level-triggered
Sampling the low level-triggered
interrupt

interrupt

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Edge-triggered interrupts
Edge-triggered interrupts

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Sampling the edge-triggered
Sampling the edge-triggered
interrupt
interrupt

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2002 MuDer Jeng
RI and TI flags and interrupts
RI and TI flags and interrupts

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Use of serial COM in the 8051
Use of serial COM in the 8051

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

CLR TI ; CLR RI