Zilog Z16C30 Manual de usuario descargar pdf (Pagina 27)

2-1

Z16C30 USC

USER'S MANUAL

ZILOG

UM97USC0100

2.1 INTRODUCTION

SER

’s M

ANUAL

CHAPTER 2

BUS INTERFACING

The USC

can be used in systems with various micropro-

cessor or backplane buses. Its flexibility with respect to

host bus interfacing derives from its Bus Configuration

activity before software writes the BCR, and from certain

other registers in the serial channels. This section de-

scribes how to use these facilities to interface the USC to

a variety of host microprocessors and buses.

2.2 MULTIPLEXED/NON-MULTIPLEXED OPERATION

same as that used on the host bus (as with a Zilog 16C0x),

then the USC’s /AS pin can be directly connected to the

corresponding bus signal. Figure 2-1 shows such a sys-

tem.

Figure 2-1. Simple Multiplexed System

16C01

AD15:AD0

/AS

USC

AD15:AD0

/AS

One important distinction among buses is whether they

include separate sets of lines for addresses and for data,

or whether the same set of lines carries multiplexed ad-

dresses and data. On a multiplexed bus, the USC captures

addressing at rising edges on /AS. If this signaling is the

UM009402-0201

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Zilog Z16C30 Manual de usuario Pagina 27