8051 Serial Port - gmitWEB

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Asynchronous Data Transmission • Data is transmitted in a frame consisting of a start bit, 8 or 9 data bits and a stop bit – Start bit is always low – Data is transmitted LSB first – Stop bit is always high • Data transmission/reception rate is controlled by baud rate generator clock – Baud rate may be a division of the crystal frequency or programmed using a timer D0 D1 D2 D3 D4 D5 D6 D7 Line Idle Start Bit Stop Bit Embedded Systems 1 5-2 8051 Peripherals
Serial Port Modes • Mode 0 – Only synchronous mode – Data transferred on RXD, clock on TXD – Clock is fixed at 1/12 of the oscillator frequency • Mode 1 – Asynchronous mode – 10-bit data frame (start bit, 8 data bits and a stop bit) – Variable baud rate – Stop bit is placed in RB8 bit of SCON register on reception of a frame Embedded Systems 1 5-3 8051 Peripherals
Page 1: 8051 Serial Port • The 8051 conta
Page 5 and 6: Data Transmission/Reception • The
Page 7 and 8: Configuring the Serial Port • Con
Page 9 and 10: Common Baud Rates Embedded Systems
Page 11 and 12: Serial Program Example 2 ; Program
Page 13 and 14: Serial Program Example 3 (cont) ;lo
Page 15 and 16: Serial I/O Expansion • A 74LS164
Page 17 and 18: Serial Input Pin Expansion • A 74
Page 19 and 20: Multi-Processor Communication • M

8051 Serial Port - gmitWEB

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