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ST162552 Fiches technique(PDF) 10 Page - Exar Corporation |
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ST162552 Fiches technique(HTML) 10 Page - Exar Corporation |
10 / 28 page 3-144 ST16C2552 BIT-2 BIT-1 MF* Function 0 0 OP2* 0 1 BAUDOUT* 1 0 RXRDY* 1 1 Reserved AFR BIT 3-7: Not used. All these bits are set to logic zero. LINE CONTROL REGISTER (LCR) The Line Control Register is used to specify the asynchronous data communication format. The num- ber of the word length, stop bits, and parity can be selected by writing appropriate bits in this register. LCR BIT1-0: These two bits specify the word length to be transmit- ted or received. BIT-1 BIT-0 Word length 00 5 01 6 10 7 11 8 LCR BIT-2: The number of stop bits can be specified by this bit. BIT-2 Word length Stop bit(s) 0 5,6,7,8 1 1 5 1-1/2 1 6,7,8 2 LCR BIT-3: Parity or no parity can be selected via this bit. 0=no parity 1=a parity bit is generated during the transmission, receiver also checks for received parity. LCR BIT-4: If the parity bit is enabled, LCR BIT-4 selects the even or odd parity format. 0=ODD parity is generated by forcing an odd number of 1’s in the transmitted data, receiver also checks for same format. 1= EVEN parity bit is generated by forcing an even number of 1’s in the transmitted data, receiver also checks for same format. LCR BIT-5: If the parity bit is enabled, LCR BIT-5 selects the forced parity format. LCR BIT-5=1 and LCR BIT-4=0, parity bit is forced to “1” in the transmitted and received data. LCR BIT-5=1 and LCR BIT-4=1, parity bit is forced to “0” in the transmitted and received data. LCR BIT-6: Break control bit. It causes a break condition to be transmitted (the TX is forced to low state). 0=normal operating condition. 1=forces the transmitter output (TX) to go low to alert the communication terminal. LCR BIT-7: The internal baud rate counter latch enable (DLAB). 0=normal operation. 1=select Divisor Latch Register and Alternate Func- tion Register. MODEM CONTROL REGISTER (MCR) This register controls the interface with the MODEM or a peripheral device (RS232). MCR BIT-0: 0=force DTR* output to high. 1=force DTR* output to low. MCR BIT-1: 0=force RTS* output to high. 1=force RTS* output to low. |
Numéro de pièce similaire - ST162552 |
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Description similaire - ST162552 |
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