PI7C9X752FAEX datasheet(5/47 Pages) DIODES

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April 2019

Diodes Incorporated

PI7C9X752

Document Number DS40312 Rev 3-2

A product Line of

Diodes Incorporated

PI7C9X752

Pin Name

48-TQFP

Pin #

Type

Description

INTB (NC) 29

When 16/68# pin is HIGH for Intel bus interface, this output becomes channel B

interrupt output. The output state is defined by the user through the software set-

ting of MCR[3]. INTB is set to the active mode and OP2A# output to LOW when

MCR[3] is set to a logic 1. INTA is set to the three state mode and OP2A# to HIGH

when MCR[3] is set to a logic 0. See MCR[3].

When 16/68# pin is LOW for Motorola bus interface, this output is not used.

TXRDYA#

UART channel A Transmitter Ready (active low). The output provides the TX

FIFO/THR status for transmit channel A. See Table 3. If it is not used, leave it

unconnected.

RXRDYA#

UART channel A Receiver Ready (active low). This output provides the RX FIFO/

RHR status for receive channel A. See Table 3. If it is not used, leave it uncon-

nected.

TXRDYB#

UART channel B Transmitter Ready (active low). The output provides the TX

FIFO/THR status for transmit channel B. See Table 4. If it is not used, leave it

unconnected.

RXRDYB#

UART channel B Receiver Ready (active low). This output provides the RX FIFO/

RHR status for receive channel B. See Table 3. If it is not used, leave it uncon-

nected.

Modem Or Serial I/O Interface

TXA

UART channel A Transmit Data or infrared encoder data. Standard transmit and

receive interface is enabled when MCR[6] = 0. In this mode, the TX signal will be

HIGH during reset or idle (no data). Infrared IrDA transmit and receive interface

is enabled when MCR[6] = 1. In the Infrared mode, the inactive state (no data) for

the Infrared encoder/decoder interface is LOW. If it is not used, leave it uncon-

nected.

RXA

UART channel A Receive Data or infrared receive data. Normal receive data input

must idle HIGH. The infrared receiver pulses typically idles at LOW but can be

inverted by software control prior going in to the decoder, see MCR[6]. If this pin

is not used, tie it to VCC or pull it high via a 100k ohm resistor.

RTSA#

UART channel A Request-to-Send (active low) or general purpose output. This

output must be asserted prior to using auto RTS flow control, see EFR[6] and

IER[6]. For auto RS485 half-duplex direction control, see DLD[6].

CTSA#

UART channel A Clear-to-Send (active low) or general purpose input. It can be

used for auto CTS flow control, see EFR[7] and IER[7]. This input should be con-

nected to VCC or GND when not used.

DTRA#

UART channel A Data-Terminal-Ready (active low) or general purpose output. If

it is not used, leave it unconnected.

DSRA#

UART channel A Data-Set-Ready (active low) or general purpose input. This input

should be connected to VCC or GND when not used.

CDA#

UART channel A Carrier-Detect (active low) or general purpose input. This input

should be connected to VCC or GND when not used.

RIA#

UART channel A Ring-Indicator (active low) or general purpose input. This input

should be connected to VCC or GND when not used.

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