PC87373 datasheet(17/174 Pages) NSC

17 / 174 page

1.0 Signal/Pin Connection and Description (Continued)

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Revision 1.1

1.4.2

Serial Port 1 and Serial Port 2 (UART1 and UART2)

Signal

Pin(s)

I/O Buffer Type Power Well

Description

CTS1

CTS2

126

IINTS

VDD3

Clear to Send. When low, indicates that the modem or other data

transfer device is ready to exchange data.

DCD1

DCD2

128

IINTS

VDD3

Data Carrier Detected. When low, indicates that the modem or

other data transfer device has detected the data carrier.

DSR1

DSR2

124

IINTS

VDD3

Data Set Ready. When low, indicates that the data transfer

device, e.g., modem, is ready to establish a communications link.

DTR_BOUT1

DTR_BOUT2

127

OO4/8

VDD3

Data Terminal Ready. When low, indicates to the modem or

other data transfer device that the UART is ready to establish a

communications link. After a system reset, these pins provide the

DTR function and set these signals to inactive high. Loopback

operation holds them inactive.

Baud Output. Provides the associated serial channel baud rate

generator output signal if test mode is selected, i.e., bit 7 of

EXCR1 register is set.

RI1

RI2

119

IINTS

VDD3

Ring Indicator. When low, indicates that a telephone ring signal

was received by the modem. These pins are monitored during

VDD power-off for wake-up event detection.

RTS1

RTS2

125

OO4/8

VDD3

Request to Send. When low, indicates to the modem or other

data transfer device that the corresponding UART is ready to

exchange data. A system reset sets these signals to inactive

high, and loopback operation holds them inactive.

SIN1

SIN2

121

IINTS

VDD3

Serial Input. Receives composite serial data from the

communications link (peripheral device, modem or other data

transfer device).

SOUT

O4/8

VDD3

Serial Output. Sends composite serial data to the

communications link (peripheral device, modem or other data

transfer device). These signals are set active high after a system

reset.

SOUT2

122

O6/12

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