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The 8051 has two timers/counters. When used as timers they can generate time delays. When used as counters they can serve as event counters. This chap- ter showed how to program the timers/counters for various modes. The two timers are accessed as two 8-bit registers: TLO and TH0 for Timer 0, and TL1 and TH1 for Timer 1. Both timers use the TMOD register to set timer operation modes. The lower 4 bits of TMOD are used for Timer 0 and the upper 4 bits are used for Timer 1. There are different modes that can be used for each timer. Mode 0 sets the timer as a 13-bit timer, mode 1 sets it as a 16-bit timer, and mode 2 sets it as an 8- bit timer. When the timer/counter is used as a timer, the 8051's crystal is used as the source of the frequency; when it is used as a counter, however, it is a pulse outside the 8051 that increments the TH, TL registers.

The 8051 has two timers/counters. When used as timers they can generate time delays. When used as counters they can serve as event counters. This chap- ter showed how to program the timers/counters for various modes. The two timers are accessed as two 8-bit registers: TLO and TH0 for Timer 0, and TL1 and TH1 for Timer 1. Both timers use the TMOD register to set timer operation modes. The lower 4 bits of TMOD are used for Timer 0 and the upper 4 bits are used for Timer 1. There are different modes that can be used for each timer. Mode 0 sets the timer as a 13-bit timer, mode 1 sets it as a 16-bit timer, and mode 2 sets it as an 8- bit timer. When the timer/counter is used as a timer, the 8051's crystal is used as the source of the frequency; when it is used as a counter, however, it is a pulse outside the 8051 that increments the TH, TL registers.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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The 8051 has two timers/counters. When used as timers they can generate time delays. When used as counters they can serve as event counters. This chap- ter showed how to program the timers/counters for various modes. The two timers are accessed as two 8-bit registers: TLO and THO for Timer 0, and TL1 and TH1 for Timer 1. Both timers use the TMOD register to set timer operation modes. The lower 4 bits of TMOD are used for Timer 0 and the upper 4 bits are used for Timer 1. There are different modes that can be used for each timer. Mode 0 sets the timer as a 13-bit timer, mode 1 sets it as a 16-bit timer, and mode 2 sets it as an 8- bit timer. When the timer/counter is used as a timer, the 8051's crystal is used as the source of the frequency; when it is used as a counter, however, it is a pulse outside the 8051 that increments the TH, TL registers.
Transcribed Image Text:The 8051 has two timers/counters. When used as timers they can generate time delays. When used as counters they can serve as event counters. This chap- ter showed how to program the timers/counters for various modes. The two timers are accessed as two 8-bit registers: TLO and THO for Timer 0, and TL1 and TH1 for Timer 1. Both timers use the TMOD register to set timer operation modes. The lower 4 bits of TMOD are used for Timer 0 and the upper 4 bits are used for Timer 1. There are different modes that can be used for each timer. Mode 0 sets the timer as a 13-bit timer, mode 1 sets it as a 16-bit timer, and mode 2 sets it as an 8- bit timer. When the timer/counter is used as a timer, the 8051's crystal is used as the source of the frequency; when it is used as a counter, however, it is a pulse outside the 8051 that increments the TH, TL registers.
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