Tutorial on Configuring and Programming the Timers of 8051/8052 in embedded C

• This repo contains a complete beginner-to-intermediate tutorial on programming and configuring the Timers of 8051 / 8052 microcontrollers using Embedded C.

• The tutorial explains 8051 Timer concepts,Timer modes, registers, delay calculations, polling vs interrupts, and provides working source codes (.c) compiled using Keil uVision and SDCC (Small Device C Compiler).

• 

Online tutorial

• 8051 / 8052 Timer Programming Tutorial using Embedded C

8051 Embedded Systems Development Kit

• 8051 Embedded Systems Development Kit – Complete with ADC0804, Opamp,ULN2003, and 7-Segment Displays

What You Will Learn

• How 8051 / 8052 timers work internally

• Difference between Timer mode and Counter mode in 8051

• Explanation of different 8051 Timer operating modes: Mode 0, Mode 1, Mode 2, Mode 3

• How to configure TMOD (Timer Mode Register) of 8051/8052

• How to configure TCON (Timer Control Register) of 8051/8052

• How to configure IE (Interrupt Enable Register) of 8051/8052 for interrupt programming

• How to calculate timer reload values for 8051 Timer

• How to generate the following delays using 8051

  • 71.1 ms delay

  • 50 ms delay

  • 1 second delay

• How to use Timer interrupts instead of polling

• Writing 8051 Timer ISRs in

  • Keil uVision

  • SDCC

Target Microcontrollers

• 8051 (AT89S51, AT89S52, P89V51RD2, STC89C52, etc.)

• 8052 variants

• Nuvoton W78E052DDG (used in this tutorial)

8051 Hardware Assumptions

• External crystal frequency: 11.0592 MHz

• Timer clock = Crystal / 12 = 0.9216 MHz

• Timer tick = 1.085 µs

Compilers Supported

• Keil uVision (C51)

• SDCC (Small Device C Compiler)