SLRC400 datasheet(12/130 Pages) PHILIPS

12 / 130 page

Philips Semiconductors

Product Specification Rev. 2.0 November 2001

•CODE Reader IC

SL RC400

Preliminary

PARALLEL INTERFACE

4.1

Overview of Supported µ-Processor Interfaces

The SL RC400 supports direct interfacing of various µ-Processor. Alternatively the Enhanced Parallel Port

(EPP) of personal computers can be connected directly.

The following table shows the parallel interface signals supported by the SL RC400:

Bus Control Signals

Bus

Separated Address and Data Bus

Multiplexed Address and Data Bus

control

NRD, NWR, NCS

NRD, NWR, NCS, ALE

address

A0, A1, A2

AD0, AD1, AD2, (AD3, AD4, AD5)

Separated Read and Write

Strobes

data

D0 … D7

AD0 … AD7

control

R/NW, NDS, NCS

R/NW, NDS, NCS, AS

address

A0, A1, A2

AD0, AD1, AD2, (AD3, AD4, AD5)

Common Read and Write

Strobe

data

D0 … D7

AD0 … AD7

control

nWrite, nDStrb, NCS, nAStrb, nWait

address

AD0, AD1, AD2, (AD3, AD4, AD5)

Common Read and Write

Strobe with Handshake

(EPP)

data

AD0 … AD7

Table 4-1: Supported µ-Processor Interface Signals

4.2

Automatic µ-Processor Interface Type Detection

After each Power-On or Hard Reset, the SL RC400 also resets its parallel µ-Processor interface mode and

checks the current µ-Processor interface type.

The SL RC400 identifies the µ-Processor interface by means of the logic levels on the control pins after the

Reset Phase. This is done by a combination of fixed pin connections (see below) and a dedicated

initialisation routine (see 11.4).

SLRC400 Datasheet(PDF) 12 Page - NXP Semiconductors

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