SC1100 datasheet(73/348 Pages) NSC

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SuperI/O Module (Continued)

4.4.1

SIO Control and Configuration Registers

Table 4-4 lists the SIO Control and Configuration registers and Table 4-5 provides their bit formats.

Table 4-4. SIO Control and Configuration Register Map

Index

Type

Name

Power Rail

Reset Value

20h

SID. SIO ID

VCORE

F5h

21h

R/W

SIOCF1. SIO Configuration 1

VCORE

01h

22h

R/W

SIOCF2. SIO Configuration 2

VPP

02h

27h

SRID. SIO Revision ID

VCORE

01h

2Eh

---

RSVD. Reserved exclusively for National use.

---

Table 4-5. SIO Control and Configuration Registers

Bit

Description

Index 20h

SIO ID Register - SID (RO)

Reset Value: F5h

7:0

Chip ID. Contains the identity number of the module. The SIO module is identified by the value F5h.

Index 21h

SIO Configuration 1 Register - SIOCF1 (RW)

Reset Value: 01h

7:6

General Purpose Scratch. When bit 5 is set to 1, these bits are RO. After reset, these bits can be R/W. Once changed to

RO, the bits can be changed back to R/W only by a hardware reset.

Lock Scratch. This bit controls bits 7 and 6 of this register. Once this bit is set to 1 by software, it can be cleared to 0 only

by a hardware reset.

0: Bits 7 and 6 of this register are R/W bits. (Default)

1: Bits 7 and 6 of this register are RO bits.

4:2

Reserved.

SW Reset. Read always returns 0.

0: Ignored. (Default)

1: Resets all devices that are reset by MR (with the exception of the lock bits) and the registers of the SWC.

Global Device Enable. This bit controls the function enable of all the logical devices in the SIO module, except the SWC

and the RTC. It allows them to be disabled simultaneously by writing to a single bit.

0: All logical devices in the SIO module are disabled, except the SWC and the RTC.

1: Each logical device is enabled according to its Activate register at Index 30h. (Default)

Index 22h

SIO Configuration 2 Register - SIOCF2 (R/W)

Reset Value: 02h

Note:

This register is reset only when VPP is first applied.

Reserved.

6:4

General Purpose Scratch. Battery-backed.

3:2

Reserved.

Reserved. (RO)

Index 27h

SIO Revision ID Register - SRID (RO)

Reset Value: 01h

7:0

SIO Revision ID. (RO) This RO register contains the identity number of the chip revision. SRID is incremented on each revi-

sion.

SC1100 Datasheet(PDF) 73 Page - National Semiconductor (TI)

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