8051 Micro-controller – Care4you

Interrupts in 8051

Ravinder Nath Rajotiya — Fri, 03 Dec 2021 10:05:38 +0000

Interrupts in 8051 What is an Interrupt: It is a requesting mechanism for the peripherals to make the microcontroller interrupt the currently executing program and run the program to service the request. The program that is run upon the interrupt is called an ISR (interrupt service routine) Types of Interrupts in 8051 There are five...

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8051 Timers

Ravinder Nath Rajotiya — Fri, 03 Dec 2021 09:34:49 +0000

Timers in 8051 There are two timer in 8051, Timer-0, Timer-1;— Use of timers: To produce precise delay timing Counting the events Generating baud rate Registers associated with timer operation are: TMOD 89h TCON 88h TH0 8Ch TL0 8Ah TH1 8Dh TL1 8Bh Format of TMOD and TCON registers TMOD SFR (89h) Timer-1 Timer-0...

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Experiment-1: Introduction to 8051 Programming environment and Hardware

Ravinder Nath Rajotiya — Wed, 16 Sep 2020 11:31:37 +0000

Introduction to Hardware ET-8031/51 KIT: General: 8-bit 8031/8051 microcontroller operating at 10/12 MHz with on-chip oscillator and clock circuit, 8 i/o lines, two 16-bit timers/counters, five sources of interrupt structure. 64 KB of external program memory and 64 KB of data memory. Memory: Kit has 8KB RAM using IC 6264 and 32KB of EEPROM...

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8051 LOGICAL INSTRUCTIONS

Ravinder Nath Rajotiya — Wed, 24 Apr 2019 17:42:12 +0000

Logical Type Instruction ANL Instruction ANL Performs bit wise AND operation between the specified byte. When used to modify an output port, the value used as the port data will be read from the output data latch, not the input pins of the port. format example Opcode/Encoding Flags affected ANL A, #data ANL A,...

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8051 Rotate Instructions

Ravinder Nath Rajotiya — Wed, 24 Apr 2019 16:59:56 +0000

ROTATE INSTRUCTIONS These instruction rotate the accumulator left, or right with or without carry. The instructions are RR, RRC, RL, RLC. RL Instruction The RL instruction rotates accumulator left one bit left Figure shows how the bits rotate left internally and then bit-7 to bit-0 No flags are affected by this instruction Figure 7.1 : Rotate left...

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