8251tr - 1=Enable 0=disable Data terminal ready 1=Enable...

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Transmitter Transmitter Buffer Register Output Register Transmitter control logic TxD TxC Txrdy TxE
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Receiver Receiver Buffer Register Input Register Receiver control logic RxD RxC Rxrdy
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Programming 8251 8251 mode register 7 6 5 4 3 2 1 0 Mode register Number of Stop bits 00: invalid 01: 1 bit 10: 1.5 bits 11: 2 bits Parity 0: odd 1: even Parity enable 0: disable 1: enable Character length 00: 5 bits 01: 6 bits 10: 7 bits 11: 8 bits Baud Rate 00: Syn. Mode 01: x1 clock 10: x16 clock 11: x64 clock
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Command word Format EH RTS ER SBRK RxE DTR TxEN IR Enable Hunt Rgister, 1=Enable search for synch character Internal reset 1=reset Request to Send 1=Enable RTS Error Reset 1=Reset Error flags PE,OE,FE Transmit Enable
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Unformatted text preview: 1=Enable 0=disable Data terminal ready 1=Enable DTR Receiver Enable 1=Enable 0=Disable Send break character 1=Forces Txd LOW Status Word format DSR SYNCDET/ BRKDET FE OE PE TXEMPTY RXRDY TxRDY Parity Error The PE flag is set when a parity error is detected. Over run Error The OE flag is set when the CPU does not read a character before the next one becomes available Framing Error The FE flag is set when a valid stop bit is not detected at the end o Every characterf Framing Error The FE flag is set when a valid stop bit is not detected at the end Every characterf...
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This note was uploaded on 02/23/2012 for the course CS 101 taught by Professor Martand during the Spring '10 term at Punjab Engineering College.

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8251tr - 1=Enable 0=disable Data terminal ready 1=Enable...

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