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Module 5: External Communication Interface

20202m

What is the required baud rate for an efficient operation of serial port devices in 8051 microcontroller?
(i) 1200
(ii) 2400
(iii) 4800
(iv) 9600

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Answer: (iv) 9600 (standard; others also usable but exam expects 9600)

Explanation: For 8051 serial communication with 11.0592 MHz crystal, the common efficient baud rates generated by Timer 1 are 1200/2400/4800/9600/19200. 9600 baud (with TH1 = 0FDH, SMOD=0, Timer1 mode 2) is the most widely used reliable default for serial port devices (PC, GSM, Bluetooth modules). Higher rates like 9600 balance speed and error (<0% error at 11.0592 MHz). Hence (iv) is considered required/efficient.

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