PC87393F datasheet(41/148 Pages) NSC

41 / 148 page

2.0 Device Architecture and Configuration (Continued)

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2.10.5

SuperI/O Configuration 4 Register (SIOCF4)

Location:

Index 24h

Type:

R/W

Bit

76543210

Name

Pin 5

Function

Select

Pin 19

Function

Select

Pin 73

Function

Select

Pin 72

Function

Select

Pin 6

Function

Select

Reset

Strap

Bit

Description

7-6

Pin 5 Function Select1

Bits

Function

7 6

0 0

GPIO34 (default when XCNF2-0 is x00)

0 1

XRD (default for all XCNF2-0 values except x00)

1 0

WDO

1 1

Reserved

In the PC87391, this pin is pulled up after reset by an internal pull-up resistor. Software should set this ﬁeld as

appropriate to enable the required Legacy function.

Pin 19 Function Select1

0: GPIO35 (default)

1: SMI

4-3

Pin 73 Function Select1

Bits

Function

4 3

0 0

XIOWR

0 1

XCS1 (default)

1 0

MTR1 (signal output is inactive, 1, when PPM mode is enabled)

1 1

DRATE0

2-1

Pin 72 Function Select1

Bits

Function

2 1

0 0

GPIO25 (default when XCNF2-0 is x00)

0 1

XCS0 (default for all XCNF2-0 values except x00, 010 and 110)

1 0

XRDY (default when XCNF2-0 is 010 or 110)

1 1

DR1 (signal output is inactive, 1, when PPM mode is enabled)

Pin 6 Function Select1

0: GPIO36 (default)

1: CLKRUN

PC87393F Datasheet(PDF) 41 Page - National Semiconductor (TI)

PC87393F Datasheet(HTML) 41 Page - National Semiconductor (TI)

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