TS68HC901 datasheet(2/42 Pages) STMICROELECTRONICS

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Figure 1: TS68HC901 Block Diagram

INTRODUCTION

The TS68HC901 multi-function peripheral (CMFP)

is a member of the 68000 peripherals. The CMFP

directly interfaces to the 68000 processor via an a-

synchronous bus structure. Both vectored and pol-

led interrupt schemes are supported, with the CMFP

providing unique vector number generation for each

of its 16 interrupt sources. Additionally, handshake

lines are provided to facilitate DMAC interfacing. Re-

fer to block diagram of the TS68HC901.

The TS68HC901 performs many of the functions

common to most microprocessor-based systems.

The resources available to the user include:

Eight Individually Programmable I/O Pins with In-

terrupt Capability

16-Source Interrupt Controller with Individual

Source Enabling and Masking

Four Timers, Two of which are Multi-Mode Ti-

mers

Timers may be used as Baud Rate Generators

for the Serial Channel

Single-Channel Full-Duplex Universal Synchro-

nous / Asynchronous Receiver-Transmitter (U-

SART) that Supports Asynchronous and with the

Addition of a Polynomial Generator Checker

Supports Byte Synchronous Formats

By incorporating multiple functions within the CMFP,

the system designer retains flexibility while minimi-

zing device count.

From a programmer’s point of view, the versatility of

the CMFP may be attributed to its register set. The

registers are well organized and allow the CMFP to

be easily tailored to a variety of applications. All of

the 24 registers are also directly addressable which

simplifies programming. The register map is shown

in Figure 2.

TS68HC901

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