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FDC87W21

Power I/O Controller with Fast Infrared Support

SMSC -> Microchip 

SYMBOL PIN

IRQ_D

37

IRQ_E

23

IRQ_F

99

XTAL1

7

XTAL2

8

nCTSA

34

nCTSB

47

nDSRA

33

nDSRB

48

nDCDA

32

nDCDB

49

nRIA

31

nRIB

50

SINA

30

SINB/

42

IRRX1

SOUTA

38

PIN2IPSEL

SOUTB

43

IRTX1

PGMDRQ

nDTRA

35

PHEFRAS

nDTRB

46

nRTSA

36

PPNPCVS

I/O

OUT12t

OUT12t

OUT12t

CLK IN

CLK

OUT

INt

INt

INt

INt

INt

INt

INt

INt

INt

INt

Interrupt request signal D

Interrupt request signal E

Interrupt request signal F

XTAL oscillator input

XTAL oscillator output

FUNCTION

SERIAL PORT INTERFACE

Clear To Send is the modem control input.

The function of these pins can be tested by reading Bit 4 of the

handshake status register.

Data Set Ready. An active low indicates the modem or data set is

ready to establish a communication link and transfer data to the

UART.

Data Carrier Detect. An active low indicates the modem or data set

has detected a data carrier.

Ring Indicator. An active low indicates that a ring signal is being

received by the modem or data set.

Serial Input. Used to receive serial data from the communication

link.

O8tc

UART A Serial Output. Used to transmit serial data out to the

communication link.

I8tc

During power-on reset, this pin is pulled up internally and is defined

as PIN2IPSEL, which provides the power-on value for CR16 bit 1

(PIN2IPSEL). A 4.7 k is recommended when intends to pull down

at power-on reset.

O8tc

UART B Serial Output. Used to transmit serial data out to the

O8tc

communication link.

I8tc

During power-on reset, this pin is pulled down internally and is

defined as PGMDRQ, which provides the power-on value for CR16

bit 3 (GMDRQ). A 4.7 k is recommended when intends to pull up

at power-on reset.

O8tc

UART A Data Terminal Ready. An active low informs the modem

or data set that the controller is ready to communicate.

I8tc

During power-on reset, this pin is pulled down internally and is

defined as PHEFRAS, which provides the power-on value for CR16

bit 0 (HEFRAS). A 4.7 k is recommended when intends to pull up

at power-on reset.

O8t

UART B Data Terminal Ready. An active low informs the modem

or data set that controller is ready to communicate.

O8tc

UART A Request To Send. An active low informs the modem or

data set that the controller is ready to send data.

I8tc

During power-on reset, this pin is pulled up internally and is defined

as PPNPCVS, which provides the power-on value for CR16 bit 2

(PNPCVS). A 4.7 k is recommended when intends to pull down

at power-on reset.

8

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