System Support

4.6.2 LPC47B397 I/O Controller Functions

The LPC47B397 I/O controller contains various functions such as the keyboard/mouse interfaces, diskette interface, serial interfaces, and parallel interface. While the control of these interfaces uses standard AT-type I/O addressing (as described in chapter 5) the configuration of these functions uses indexed ports unique to the LPC47B397. In these systems, hardware strapping selects I/O addresses 02Eh and 02Fh at reset as the Index/Data ports for accessing the logical devices within the LPC47B397. Table 4-16 lists the PnP standard control registers for the LPC47B397.

Table 4-16.

LPC47B397 I/O Controller Control Registers

Index

Function

Reset Value

02h

Configuration Control

00h

03h

Reserved

 

07h

Logical Device (Interface) Select:

00h

 

00h

= Diskette Drive I/F

 

 

01h

= Reserved

 

 

02h = Reserved

 

 

03h = Parallel I/F

 

 

04h

= Serial I/F (UART 1/Port A)

 

 

05h

= Serial I/F (UART 2/Port B)

 

 

06h

= Reserved

 

 

07h = Keyboard I/F

 

 

08h

= Reserved

 

 

09h

= Reserved

 

 

0Ah = Runtime Registers (GPIO Config.)

 

 

0Bh = SMBus Configuration

 

 

 

 

20h

Super I/O ID Register (SID)

56h

21h

Revision

--

22h

Logical Device Power Control

00h

 

 

 

23h

Logical Device Power Management

00h

24h

PLL / Oscillator Control

04h

25h

Reserved

 

 

 

 

26h

Configuration Address (Low Byte)

 

27h

Configuration Address (High Byte)

 

28-2Fh

Reserved

 

NOTE:

For a detailed description of registers refer to appropriate SMC documentation.

Technical Reference Guide

361834-002

4-27