PC87382 datasheet(27/72 Pages) NSC

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3.0 Device Architecture and Configuration (Continued)

Revision 1.2

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3.7.2

SuperI/O Configuration 1 Register (SIOCF1)

Location: Index 21h

Type:

Varies per bit

3.7.3

SuperI/O Configuration 2 Register (SIOCF2)

This register is reset by hardware to 63h.

Location: Index 22h

Type:

R/W or RO

This register is reserved. It must be written with 63h

Bit

43210

Name

LOCKMCF

LOCKGCF

Reserved

IOWAIT

Reserved

GLOBEN

Reset

10001

Bit

Type

Description

R/W1S LOCKMCF (Lock Multiplexing Configuration). When set to 1, this bit locks the conﬁguration of

registers SIOCF1 and SIOCF2 by disabling writing to all bits in these registers (including the LOCKMCF

bit itself), except for the LOCKGCF and GLOBEN bits in SIOCF1. Once set, this bit can only be cleared

by Hardware reset.

0: R/W bits are enabled for write (default).

1: All bits are RO.

R/W1S LOCKGCF (Lock GPIO Pins Configuration). When set to 1, this bit locks the conﬁguration registers

of all GPIO pins (see Section 3.10.3 on page 33) by disabling writes to all their bits (including the

LOCKGCF bit itself). The locked registers include the GPCFG (except LOCKCFP bit) and GPEVR

registers of all GPIO pins. Once set, this bit can only be cleared by Hardware reset.

0: R/W bits are enabled for write (default).

1: All bits are RO.

5-4

Reserved. These bits must be ‘01’.

3-2

R/W or

IOWAIT (Number of I/O Wait States). These bits set the number of wait states for I/O transactions

through the LPC bus.

Bits

3 2

Number of Wait States

0 0:

0 (default)

0 1:

1 0:

1 1:

Reserved. This bit must be 0.

R/W or

GLOBEN (Global Device Enable). This bit makes it possible to disable all logical devices by setting a

single bit (to 0). In addition, when the bit is set to 1, it enables the operation of all the logical devices

of the PC87382, as long as the logical device is itself enabled (see Table 7 on page 19). The behavior

of the different devices is explained in Section 3.3 on page 24.

0: All logical devices in the PC87382 are disabled and their resources are released.

1: Enables each PC87382 logical device that is itself enabled (default); see Section 3.3.1 on page 24.

PC87382 Datasheet(PDF) 27 Page - National Semiconductor (TI)

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