PC87413 datasheet(24/257 Pages) NSC

24 / 257 page

1.0 Signal/Pin Connection and Description (Continued)

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Revision1.2

1.4.4

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

Signal

Pin/s

I/O Buffer Type Power Well

Description

CTS1

CTS2

107

IINTS

VDD

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

transfer device is ready to exchange data.

DCD1

DCD2

102

IINTS

VDD

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

other data transfer device has detected the data carrier.

DSR1

DSR2

103

IINTS

VDD

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

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

DTR1_

BOUT1

DTR2_

BOUT2

100

108

OO3/6

VDD

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 the

EXCR1 register is set.

RI1

RI2

101

109

IINTS

VDD

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

has been received by the modem. These pins are monitored

during VDD power-off for wake-up event detection.

RTS1

RTS2

105

OO3/6

VDD

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

104

IINTS

VDD

Serial Input. Receives composite serial data from the

communications link (peripheral device, modem or other data

transfer device).

SOUT1

SOUT2

106

OO3/6

VDD

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.

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