PC87365 datasheet(184/215 Pages) NSC

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11.0 Legacy Functional Blocks

This chapter briefly describes the following blocks that provide legacy device functions:

Keyboard and Mouse Controller (KBC).

Floppy Disk Controller (FDC).

Parallel Port.

Serial Port 1 (SP1), UART Functionality for both Serial Port 1 and Serial Port 2.

Serial Port 2 (SP2), Infrared Functionality.

The description of each Legacy block includes the sections listed below. For more information about legacy blocks, contact

your National representative.

General Description.

Bitmap table(s).

The register maps in this chapter use the following abbreviations for Type:

R/W = Read/Write.

R = Read from a speciﬁc address returns the value of a speciﬁc register. Write to the same address is to a different

W = Write.

RO = Read Only.

R/W1C = Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect.

11.1 KEYBOARD AND MOUSE CONTROLLER (KBC)

11.1.1

General Description

The KBC is implemented physically as a single hardware module and houses two separate logical devices: a Mouse con-

troller and a Keyboard controller.

The KBC is functionally equivalent to the industry standard 8042A Keyboard controller, which may serve as a detailed tech-

nical reference for the KBC.

11.1.2

KBC Register Map

11.1.3

KBC Bitmap Summary

Offset

Mnemonic

Type

00h

DBBOUT Read KBC Data

DBBIN

Write KBC Data

04h

STATUS Read Status

DBBIN

Write KBC Command

Bits

Offset

Mnemonic

76543210

00h

DBBOUT

KBC Data Bits (For Read cycles)

DBBIN

KBC Data Bits (For Write cycles)

04h

STATUS

General Purpose Flags

IBF

OBF

DBBIN

KBC Command Bits (For Write cycles)

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