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W83977EF-AW Datasheet(PDF) 14 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 14 Page - Winbond |
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14 / 142 page  W83977EF-AW/W83977EG-AW -12- Serial Port Interface, continued RTSB# 50 I/O8t UART B Request To Send. An active low signal informs the modem or data set that the controller is ready to send data. DTRA# PNPCSV# 44 I/O8t UART A Data Terminal Ready. An active low signal informs the modem or data set that the controller is ready to communicate. During power-on reset, this pin is pulled down internally and is defined as PNPCSV#, which provides the power-on value for CR24 bit 0 (PNPCSV#). A 4.7 k Ω is recommended if intends to pull up. (clear the default value of FDC, UARTs, and PRT) DTRB# 51 I/O8t UART B Data Terminal Ready. An active low signal informs the modem or data set that controller is ready to communicate. SINA SINB 45, 52 INt Serial Input. Used to receive serial data through the communication link. SOUTA 46 I/O8t UART A Serial Output. Used to transmit serial data out to the communication link. PENKBC During power-on reset, this pin is pulled down internally and is defined as PENKBC, which provides the power-on value for CR24 bit 2 (ENKBC). A 4.7 k Ω resistor is recommended if intends to pull up. (enable KBC) SOUTB PEN48 53 I/O8t UART B Serial Output. During power-on reset, this pin is pulled down internally and is defined as PEN48, which provides the power-on value for CR24 bit 6 (EN48). A 4.7 k Ω resistor is recommended if intends to pull up. DCDA# DCDB# 47 54 INt Data Carrier Detect. An active low signal indicates the modem or data set has detected a data carrier. RIA# RIB# 65 66 INt Ring Indicator. An active low signal indicates that a ring signal is being received from the modem or data set. 4.4 Infrared Interface SYMBOL PIN I/O FUNCTION IRRX 37 INcs Infrared Receiver input. IRTX 38 OUT12t Infrared Transmitter Output. |
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