PC87372 datasheet(15/144 Pages) NSC

15 / 144 page

1.0 Signal/Pin Connection and Description (Continued)

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Revision 1.2

1.4.2

Serial Port (UART)

Signal

Pin(s)

I/O Buffer Type Power Well

Description

CTS

INTS

VDD3

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

transfer device is ready to exchange data.

DCD

INTS

VDD3

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

other data transfer device has detected the data carrier.

DSR

INTS

VDD3

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

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

DTR_BOUT

O3/6

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.

INTS

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.

RTS

O3/6

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.

SIN

INTS

VDD3

Serial Input. Receives composite serial data from the

communications link (peripheral device, modem or other data

transfer device).

SOUT

O3/6

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.

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