ACS8530 datasheet(43/152 Pages) SEMTECH

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ADVANCED COMMUNICATIONS

FINAL

DATASHEET

Revision 3.02/November 2005 © Semtech Corp.

Page 43

www.semtech.com

ACS8530 SETS

Introduction to Microprocessor Modes

The ACS8530 incorporates a microprocessor interface, which can be configured for all common microprocessor

interface types, via the bus interface mode control pins UPSEL(2:0) as defined in Table 19.

These pins are read at power up and set the interface mode.

The optional EPROM mode allows the internal registers to be loaded from the EPROM when the device comes out of

“power-on reset” mode. The microprocessor interface type can be altered after power up by Reg. 7F, such that for

instance the device could boot up in EPROM mode and then switch to Motorola mode, for example, after the EPROM

data has preconditioned the device. Reading of Data from the EPROM at boot up time is handled automatically by the

ACS8530. The chip select of the EPROM should be driven from the micro in the case of mixed EPROM and micro

communication, in order to avoid conflict between EPROM and ACS8530 access from the microprocessor.

The following sections show the interface timings for each interface type.

Timing diagrams for the different microprocessor modes are presented on pages 44 to 52.

Microprocessor Interface

Table 19 Microprocessor Interface Mode Selection

UPSEL(2:0)

Mode

Description

111 (7)

OFF

Interface disabled

110 (6)

OFF

Interface disabled

101 (5)

SERIAL

Serial uP bus interface

100 (4)

MOTOROLA

Motorola interface

011 (3)

INTEL

Intel compatible bus interface

010 (2)

MULTIPLEXED

Multiplexed bus interface

001 (1)

EPROM

EPROM read mode

000 (0)

OFF

Interface disabled

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