8051 chap5 serial VI XỬ LÝ

ĐH Bách Khoa TP.HCM Lê Chí Thông

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Chapter 5

Serial Port Operation

The 8051 Microcontroller

Lê Chí Thông

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Ref. I. Scott Mackenzie, The 8051 Microcontroller

Serial Port

• RXD (P3.0) and TXD (P3.1) pins

• Full Duplex: simultaneous transmission and reception

• 2 special function registers: SCON and SBUF

• SCON: status bits and control bits

• SBUF: same address but 2 buffers; 1 buffer for

transmission and 1 buffer for reception

• Baud rate (serial port frequency of operation) is

supplied and programmed by Timer1

Ref. I. Scott Mackenzie Lê Chí Thông 2