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73K222AU-IH Datasheet(PDF) 7 Page - TDK Electronics |
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73K222AU-IH Datasheet(HTML) 7 Page - TDK Electronics |
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7 / 40 page  73K222AU Single-Chip Modem with UART 7 UART CONTROL INTERFACE (STNDLN = 1) (See Figure 1: Single-port mode) NAME DIP PLCC TYPE DESCRIPTION ADS 23 25 I Address Strobe. ADS is used to latch address and chip select to simplify interfacing to a multiplexed Address/Data Bus. UA0- UA3 and CS@ are latched when the ADS signal goes high. UA3 12 14 I UART Address Bit 3. UA3 is used in single-port mode to address the modem registers from the 16C450 interface. If UA3 is 0, the normal 16C450 registers are addressed by UA0-UA2 and if UA3 is 1, the modem registers are addressed. UA3 is latched when ADS goes high. CTS 14 16 I Clear to Send. This pin is the complement of CTS bit in the Modem Status Register. The signal is used in modem handshake control to signify that communications have been established and that data can be transmitted. DSR 13 15 I Data Set Ready. This pin is the complement of DSR bit in the Modem Status Register. The signal is used in modem handshake to signify that the modem is ready to establish communications. DCD 11 13 I Data Carrier Detect. This pin is the complement of DCD bit in the Modem Status Register. The signal is used in modem control handshake to signify that the modem is receiving a carrier. DTR 22 24 O Data Terminal Ready. The DTR output is programmed through a bit in the Modem Control Register. The signal is used in modem handshake to signify that the 16C450 is available to communicate. RTS 23 O Request to Send. The RTS output is programmed through a bit in the Modem Control Register. The signal is used in modem handshake to signify that the 16C450 has data to transmit. RI 810 I Ring Indicator. This Indicates that a telephone ringing signal is being received. This pin is the complement of the RI bit in the Modem Status Register. |
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