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

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产品描述 (功能)

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FDC87W22

Power I/O Controller

SMSC -> Microchip 

SYMBOL

PIN

I/O

FUNCTION

nDTRA

PHEFRAS

35

I/O8t UART A Data Terminal Ready. An active low informs the

modem or data set that the controller is ready to

communicate.

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 47 kΩ is recommended when

intends to pull up at power-on reset.

nDTRB

46

O8t

UART B Data Terminal Ready. An active low informs the

modem or data set that controller is ready to communicate.

nRTSA

PPNPCVS

36

I/O8t UART A Request To Send. An active low informs the

modem or data set that the controller is ready to send data.

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 47 kΩ is recommended when

intends to pull down at power-on reset.

nRTSB

45

I/O8t UART B Request To Send. An active low informs the

PGOIQSEL

modem or data set that the controller is ready to send data.

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

is defined as PGOIQSEL, which provides the power-on

value for CR16 bit 4 (GOIQSEL). A 47 kΩ is recommended

when intends to pull up at power-on reset.

8

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