PC87393 datasheet(39/148 Pages) NSC

39 / 148 page

2.0 Device Architecture and Configuration (Continued)

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2.10.3

SuperI/O Configuration 2 Register (SIOCF2)

Location:

Index 22h

Type:

R/W

Bit

7654

210

Name

Pin 87

Function

Select

Pins 95-90

Function

Select

Pins 81-74

Function

Select

Pins 3-1 and 100-96

Function

Select

Reset

Strap

Bit

Description

7-6

Pin 87 Function Select

Bits

Function

7 6

0 0

GPIO26 (default for all XCNF2-0 values, except x01)

0 1

XA6 (default when XCNF2-0 is x01)

1 0

PIRQA

1 1

XSTB2

5-4

Pins 95-90 Function Select

Bits

Function

5 4

0 0

GPIO20-24, XSTB1 (default when XCNF2-0 is x00)

0 1

XA5-0 (default when XCNF2-0 is x01)

1 0

XA3-0, XSTB0, XSTB1 (default for all XCNF2-0 values, except x00 and x01)

1 1

Reserved

3-2

Pins 81-74 Function Select1

Bits

Function

3 2

0 0

GPIO10-17 (default when XCNF2-0 is x00, 110 or 111)

0 1

XA12-19 (default when XCNF2-0 is x01, 010 or 011)

1 0

JOYABTN1, JOYBBTN1, JOYAY, JOYBY, JOYAX, JOYBX, JOYABTN0, JOYBBTN0

1 1

RI2, DTR2_BOUT2, CTS2, SOUT2, RTS2, SIN2, DSR2, DCD2

In the PC87391, these pins are pulled up after reset by an internal pull-up resistor. Software should set this

ﬁeld to 11 to enable the UART 2 function.

1-0

Pins 3-1 and 100-96 Function Select

Bits

Function

1 0

0 0

GPIO00-07 (default when XCNF2-0 is x00)

0 1

XD0-7 (default for all XCNF2-0 values, except x00)

1 0

JOYABTN1, JOYBBTN1, JOYAY, JOYBY, JOYAX, JOYBX, JOYABTN0, JOYBBTN0

1 1

Reserved

PC87393 Datasheet(PDF) 39 Page - National Semiconductor (TI)

PC87393 Datasheet(HTML) 39 Page - National Semiconductor (TI)

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