Timer
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The document discusses programming timers on the 8051 microcontroller. It describes the basic registers used for timers 0 and 1, which are 16-bit timers each split into two 8-bit registers (TL0/TH0 and TL1/TH1) that can be accessed like general purpose registers. It also covers the TMOD register, an 8-bit register used to set the operation modes of timers 0 and 1, with the lower 4 bits controlling timer 0 and upper 4 bits controlling timer 1.
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Here are the key steps for programming timer 0 in mode 2:
1. Select mode 2 for timer 0 by writing to the TMOD register:
MOV TMOD,#02h
2. Write the initial count value to TH0:
MOV TH0,#0FCh
3. Clear the timer flag TF0:
CLR TF0
4. Start the timer by setting TR0:
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5. The timer will now count down from the value in TH0 (0FCh) to 0 in TL0.
6. When TL0 underflows to 0, TF0 will be set.
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1. Select mode 2 for timer 0 by writing to the TMOD register:
MOV TMOD,#02h
2. Write the initial count value to TH0:
MOV TH0,#0FCh
3. Clear the timer flag TF0:
CLR TF0
4. Start the timer by setting TR0:
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5. The timer will now count down from the value in TH0 (0FCh) to 0 in TL0.
6. When TL0 underflows to 0, TF0 will be set.
7. Check TF0 to detect overflow:
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1. The 8051 has two 16-bit timers, T0 and T1, that can operate in different modes set by the TMOD register to function as timers or counters.
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The document discusses the 8051 microcontroller, its features, and applications. It provides details on the 8051's architecture including its CPU, memory blocks, I/O ports, timers/counters, and serial communication capabilities. It describes the 8051's registers including TMOD and TCON for timer control. The document also covers the 8051's memory mapping and provides many examples of how 8051 microcontrollers are used in applications like cell phones, appliances, industrial systems, and more.
lecture 12 counter_microcontroller2.ppt
Timer/counters on the 8051 microcontroller can be used for time delay generation, event counting, and baud rate generation. The 8051 has two timers/counters: timer/counter 0 and timer/counter 1. They can operate in different modes like 13-bit timer, 16-bit timer, 8-bit auto reload, and split timer. Special function registers like TMOD, TCON, TH0, TL0, TH1, TL1 are used to control the timers. The timers can be clocked from the internal oscillator or an external source and generate interrupts on overflow. Programs examples are shown to generate square waves and interface with a buzzer using timers.
Interrupt programming with 8051 microcontroller
this ppt is related to the intrupts related to the 8051 microcontroller ..
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8051 timers--2
The document discusses the timers of the Intel 8051 microcontroller. It describes that the 8051 has two 16-bit timers, Timer 0 and Timer 1, that are located in Special Function Registers. The timers can be configured and operated individually. They can be used to generate time intervals, count external events, and generate baud rates. The document explains how the timers work, including how they increment each machine cycle and overflow after reaching their maximum value of FFFF hexadecimal. It also covers the Timer Mode Register (TMOD) and Timer Control Register (TCON) that are used to configure the operating modes and control the timers.
B sc e5.2 mp unit 4 mc-8051
The document discusses the 8051 microcontroller. It was introduced by Intel in 1981 as an 8-bit microcontroller with features like 128 bytes of RAM, 4K bytes of ROM, timers, ports, and peripherals integrated onto a single chip. This led to variants like the 8052 with more RAM and an extra timer. The 8031 has no on-chip ROM. Microcontrollers are used in embedded systems for tasks like displaying microwave information or receiving remote signals. They have lower costs and power usage than microprocessors. The 8051 architecture includes registers like the accumulator, R registers, B register, data pointer, and program counter to interface with memory, ports and peripherals via a system bus.
Microcontroller 8051
The document provides an overview of microcontrollers and the 8051 microcontroller. It begins with a brief history of microcontrollers and how they evolved from microprocessors by integrating RAM, ROM, I/O and other components onto a single chip. It then describes the architecture and components of the 8051 microcontroller, including its memory mapping, registers, I/O ports, timers and interrupts. Examples are given of how the 8051's timers and I/O ports can be programmed. The document aims to educate designers on the capabilities and programming of the 8051 microcontroller.
TIMERS.pptx
The document discusses timers in the 8051 microcontroller. It notes that the 8051 has two 16-bit timers that can be individually configured and controlled. The timers can operate in four different modes: 13-bit timer mode, 16-bit timer mode, 8-bit auto-reload mode, and split timer mode. Special function registers like TMOD, TCON, TH0/TL0 and TH1/TL1 are used to configure and control the timers. The timers can generate interrupts on overflow and be used for tasks like timing functions and baud rate generation.
8051 timer counter
The document discusses the timers and counters of the 8051 microcontroller. It describes the registers used including TMOD and TCON. TMOD is used to select the mode of operation for timers 0 and 1. TCON controls the running of the timers using TR bits and indicates overflow using TF bits. Four modes of operation are described for the timers - 13-bit, 16-bit, 8-bit auto reload, and split timer. The timers can also be used as event counters by connecting an external signal to the T0 and T1 pins and setting the appropriate bits in TMOD.
moving message display of lcd
The document provides an overview of PIC microcontrollers and the key features of the PIC16F72 microcontroller. It discusses the microcontroller's program memory, data memory, I/O ports, timers, and peripheral features. The three timers - Timer 0, Timer 1, and Timer 2 - are described, with Timer 0 and Timer 1 discussed in further detail regarding their configuration and operating modes.
Microcontroller-8051.ppt
The document provides an overview of the 8051 microcontroller, including its features, applications, and architecture. It discusses the 8051's registers, memory mapping, I/O ports, timers, and interrupts. It also covers the evolution of microcontrollers from early chips like the Intel 8048 and 8051 to more modern 32-bit architectures. The 8051 is highlighted as a popular microcontroller due to its small size, low cost, and ability to be used in a wide range of applications.
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Timer
- 1. The 8051 Microcontroller andThe 8051 Microcontroller and Embedded SystemsEmbedded Systems CHAPTER 9 8051TIMER PROGRAMMING IN ASSEMBLY Hala kamal 1
- 2. 2 SECTION 9.1: PROGRAMMING 8051 TIMERS
- 3. 3
- 4. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS Basic registers of the timer ◦ Timer 0 and Timer 1 are 16 bits wide ◦ each 16-bit timer is accessed as two separate registers of low byte and high byte. 4
- 5. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS Timer 0 registers ◦ low byte register is called TL0 (Timer 0 low byte) and the high byte register is referred to as TH0 (Timer 0 high byte) ◦ can be accessed like any other register, such as A, B, R0, R1, R2, etc. ◦ "MOV TL0, #4 FH" moves the value 4FH into TL0 ◦ "MOV R5, TH0" saves TH0 (high byte of Timer 0) in R5 5
- 6. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS 6 Figure 9–1 Timer 0 Registers
- 7. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS Timer 1 registers ◦ also 16 bits ◦ split into two bytes TL1 (Timer 1 low byte) and TH1 (Timer 1 high byte) ◦ accessible in the same way as the registers of Timer 0. 7
- 8. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS 8 Figure 9–2 Timer 1 Registers
- 9. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS TMOD (timer mode) register ◦ timers 0 and 1 use TMOD register to set operation modes . ◦ 8-bit register ◦ lower 4 bits are for Timer 0 ◦ upper 4 bits are for Timer 1 ◦ lower 2 bits are used to set the timer mode. ◦ upper 2 bits to specify the operation 9
- 10. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS 10 Figure 9–3 TMOD Register
- 11. SECTION 9.1: PROGRAMMING 8051SECTION 9.1: PROGRAMMING 8051 TIMERSTIMERS 11
- 12. 12
- 13. 13