8051 serial communication-UART

8051 Serial Communication-UART www.pantechsolutions.net

SERIAL COMMUNICATION WITH 8051

SERIAL COMMUNICATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

BASICS OF SERIAL COMMUNICATION Serial versus Parallel Data Transfer

SERIAL COMMUNICATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DIFFERENT TYPES OF TRANSMISSION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SERIAL COMMUNICATION Framing ASCII “A” (41H)

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],BAUD RATE

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RS232 PIN VOLTAGE DETAILS

PIN DESCRIPTION DB-9 9-Pin Connector IBM PC DB-9 Signals

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],DATA COMMUNICATION

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RXD AND TXD PINS

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],MAX232

DIFFERENT BAUD RATES Timer 1 TH1 Register Values for Various Baud Rates

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],REGISTERS

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ASSEMBLY CODE FOR SERIAL COMMUNICATION

[object Object],solution Solution:with XTAL=11.0592 MHz: Machine cycle frequency: 11.0592 MHz/12 = 921.6kHz, Frequency provided by UART: 921.6kHz/32 =28,800 Hz (if SMOD=0) or 921.6kHz/16 =57,600 Hz (if SMOD=1) should be provided by Timer 1 to set baud rate. Case I: SMOD=0. (a) 28,800/9,600 = 3. 256-3 = 253 = FDh (b) 28,800/2,400 = 12. 256-12 = 244 = F4h (c) 28,800/1,200 = 24. 256-24 = 232 = E8h should be loaded into TH1. Case II: SMOD=1. (a) 57,600/9,600 = 6. 256-6 = 250 = FAh (b) 57,600/2,400 = 24. 256-24 = 232 = E8h (c) 57,600/1,200 = 48. 256-48 = 232 = D0h should be loaded into TH1. XTAL OSC ÷ 12 ÷ 32 by UART (SMOD=0) 11.0592 MHz 28,800 Hz 921.6 kHz ÷ 16 by UART (SMOD=1) 57,600 Hz Timer 1

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],EXAMPLES

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],C CODE FOR SERIAL COMMUNICATION

For More Tutorials ,[object Object],[object Object],[object Object],[object Object]

8051 serial communication-UART

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