8051 Serial Port and Timer/Counter Serial Port Timer Counter - PowerPoint PPT Presentation

Dec 29, 2023 •573 likes •661 views

8051 Serial Port and Timer/Counter Serial Port Timer Counter Chatchai Jantaraprim (cj@coe.psu.ac.th) 8051 Serial Port Serial communications High speed CMOS signal levels Full duplex No modem status/control signals Registers SBUF Two

8051 Serial Port and Timer/Counter Serial Port Timer Counter Chatchai Jantaraprim (cj@coe.psu.ac.th)
8051 Serial Port Serial communications High speed CMOS signal levels Full duplex No modem status/control signals Registers SBUF� Two separate data buffers for transmit and receive SCON Control register SMOD Addition bit to double baud speed TH1 Timer/counter 1 high byte for baud rate control in mode 1, 3
8051 Serial Port SCON Register 7 6 5 4 3 2 1 0 SM0 SM1 SM2 REN TB8 RB8 TI RI SCON
8051 Serial Port SCON Register (cont.) RI�Receive Interrupt Flag Set by hardware on received. must clear by software TI�Transmit Interrupt Flag Set by hardware on transmitted, must clear by hardware RB8 �Receive bit 8 Mode 2,3 : copy of bit 8 Mode 1 & SM2 clear : copy of stop bit TB8 �Transmit bit 8 The 9th data bit of mode 2,3. Set or clear by software REN �Receive Enable Set by software to enable reception, if is cleared reception will be blocked. SM2 �Serial Mode (bit 2) Use in mode 2,3 for multiprocessor communications
8051 Serial Port SCON Register (cont.) SM1 & SM0�Serial Mode (bit 6 & 7) Operating modes Operating modes Mode 0�8-bit shift register, f/12 1Mbit with 12Mhz Oscillator Frequency Mode 1�8-bit UART, variable baud rate Mode 2�9-bit UART, f/64 or f/32 187.5K and 375K with 12MHz Oscillator Frequency Mode 3�9-bit UART, variable baud rate
8051 Serial Port Baud Rate Variable Baud Rate SMOD Baud Rate = 2 x f ------------------------- 384 x (256 - TH1) Baud Rate f SMOD TH1 62.5K 12.000 1 FFh 19.2K 11.059 1 FDh 9.6K 11.059 0 FDh 4.8K 11.059 0 FAh 2.4K 11.059 0 F4h 1.2K 11.059 0 E8h
8051 Serial Port Initialize Serial Port Subroutine Set baud rate to 9600 for 11.0592 Crystal mov TMOD, #20h�; set timer 1 for auto reload mov TCON, #41h�; run counter 1 edge trig mov TH1, #0FDh�; 9600 baud mov SCON, #50h�; 8-bit data mode 1 Sending and Receiving Subroutines sndchr: getchr: clr TI jnb RI, getchr mov SBUF, A mov A, SBUF txloop: jnb TI, txloop clr RI ret ret

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