8051 Serial Port - gmitWEB
8051 Serial Port - gmitWEB
8051 Serial Port - gmitWEB
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<strong>Serial</strong> <strong>Port</strong> Modes<br />
• Mode 2<br />
– Asynchronous mode<br />
– 11-bit data frame (start bit, 8 data bits, programmable 9 th bit and a stop bit)<br />
– On transmission 9 th bit is TB8 bit of SCON<br />
– On reception 9 th bit is placed in RB8 bit of SCON<br />
– 9 th bit may be used for data or as a parity bit<br />
– Baud rate may be 1/32 or 1/64 of oscillator frequency<br />
• Mode 3<br />
– Same as Mode 2 but with a programmable baud rate<br />
Embedded Systems 1 5-4 <strong>8051</strong> Peripherals
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