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73K222AU

Single-Chip Modem Modem with UART

TDK Corporation 

73K222AU

Single-Chip Modem

with UART

UART CONTROL INTERFACE (STNDLN = 1)

(See Figure 1: Single-port mode)

NAME

ADS

UA3

CTS

DSR

DCD

DTR

RTS

RI

DIP PLCC TYPE DESCRIPTION

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.

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.

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.

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.

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.

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.

2

3

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.

8

10

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.

7

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