PI7C9X752FAEX datasheet(28/47 Pages) DIODES

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April 2019

Diodes Incorporated

PI7C9X752

Document Number DS40312 Rev 3-2

A product Line of

Diodes Incorporated

PI7C9X752

Offset 05H(default=60H)--- Line Status Register (LSR). Accessible when LCR[7]=0.

Bit

Type

Description

Receiver FIFO Data Error Flag.

0 = No FIFO Error

1 = a flag for the sum of all error bits(parity error, framing error, or break)in the RX FIFO. This bit

clears when there is no more error in any of the bytes in the RX FIFO

THR and TSR Empty Flag

This bit is set whenever the transmitter goes idle, it clears whenever either the THR or TSR contains a

data character.

THR Empty Flag

This bit is set when the last data byte is transferred from THR to TSR.

When set,Xon Any function is enabled and receiving any character will resume transmit operation.

The RX character will be loaded into the RX FIFO, unless the RX character is an Xon/Xoff character

and receiver software flow control is enabled.

When set, internal loopback mode is enabled and TX output is looped back to the RX input internally,

and MCR[1:0] signals are looped back into MSR[4:5]

Interrupt output control

0 = Forces the INT(A-D) output to high-impedance state (interrupt disable)

1 = INT(A-D) outputs to the active state (interrupt enable)

The interrupt enable state can be overridden by INTSEL pin:

INTSEL MCR[3] INTA-D outputs in 16 mode

Hi-Z

Active

If Internal Loopback Mode(MCR[4]=1) is enabled, This bit is OP2 and is outputted to CD internally

OP2# can be used as a general purpose output:

0 = OP2# output set HIGH

1 = OP2# output set LOW

FIFORdy register read enabled when MCR[4]=0 and ASR[0]=0 or OP1 if Internal Loopback

Mode(MCR[4]=1) is enabled and is outputted to RI internally

RTS pin control: 0 = force RTS pin High

1 = force RTS pin Low

When internal loopback mode, it controls MSR[4].

if Auto-RTS is enabled, the RTS pin is controlled by hardware flow control

if the modem interface is not used, this output may be used as a general purpose output

DTR pin control: 0 = force DTR pin High

1 = force DTR pin Lowuart_transmitter.

When internal loopback mode, it controls MSR[5].

if the modem interface is not used, this output may be used as a general purpose output

Note: MCR[7:5] can only be modified if EFR[4]=1.

PI7C9X752FAEX Datasheet(PDF) 28 Page - Diodes Incorporated

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