FDC87W22 查看數據表（PDF） - SMSC -> Microchip

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FDC87W22

Power I/O Controller

SMSC -> Microchip 

SYMBOL

PIN

IRQ_B/

92

GIO0

IRQ_C

44

IRQ_D

37

IRQ_E

23

IRQ_F

99

XTAL1

7

XTAL2

8

Serial Port Interface

SYMBOL

PIN

nCTSA

34

nCTSA

47

nDSRA

33

nDSRB

48

nDCDA

32

nDCDB

49

nRIA

31

nRIB

50

SINA

30

SINB/IRRX1

42

SOUTA/

38

PIRIDE

SOUTB/

43

IRTX1/

PGMDRQ

I/O

OUT12t

I/O12t

OUT12t

OUT12t

OUT12t

OUT12t

INc

OUT8t

FUNCTION

When CR16 Bit 4 (GOIQSEL) = 0: Interrupt request signal

B;

When CR16 Bit 4 (GOIQSEL) = 1: General Purpose I/O port

0.

Interrupt request signal C

Interrupt request signal D

Interrupt request signal E

Interrupt request signal F

XTAL oscillator input

XTAL oscillator output

I/O

FUNCTION

INt

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.

INt

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.

INt

Data Carrier Detect. An active low indicates the modem or

data set has detected a data carrier.

INt

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

being received by the modem or data set.

INt

Serial Input. Used to receive serial data from the

communication link.

I/O8t UART A Serial Output. Used to transmit serial data out to

the communication link.

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

defined as PIRIDE, which provides the power-on value for

CR16 bit 1 (IRIDE). A 47 kΩ is recommended when intends

to pull down at power-on reset.

I/O8t UART B Serial Output. Used to transmit serial data out to

the communication link.

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

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

CR16 bit 3 (GMDRQ). A 47 kΩ is recommended when

intends to pull down at power-on reset.

7

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