ST9040 datasheet(5/56 Pages) STMICROELECTRONICS

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1.1GENERAL DESCRIPTION

The ST9040 is a ROM member of the ST9 family of

microcontrollers, completely developed and pro-

duced by SGS-THOMSON Microelectronics using

a proprietary n-well HCMOS process.

The ST9040 peripheral and functional actions are

fully compatible throughout the ST903x/4x family.

This datasheet will thus provide only information

specific to this ROM device.

THE READER IS ASKED TO REFER TO THE

DATASHEET OF THE ST9036 ROM-BASED DE-

VICE FOR FURTHER DETAILS.

The nucleus of the ST9040 is the advanced Core

which includes the Central Processing Unit (CPU),

the Register File, a 16 bit Timer/Watchdog with 8

bit Prescaler, a Serial Peripheral Interface support-

ing S-bus, I

2C-bus and IM-bus Interface,plus two 8

bit I/O ports. The Core has independent memory

and register buses allowing a high degree of pipe-

lining to add to the efficiency of the code execution

speed of the extensive instruction set. The power-

ful I/O capabilities demanded by microcontroller

applications are fulfilled by the ST9040 with up to

56 I/O lines dedicated to digital Input/Output.

These lines are grouped into up to seven 8 bit I/O

Ports and can be configured on a bit basis under

software control to provide timing, status signals,

an address/data bus for interfacing external mem-

ory, timer inputs and outputs, analog inputs, exter-

nal interrupts and serial or parallel I/O with or

without handshake.

Three basic memory spaces are available to support

this wide range of configurations: Program Memory

(internal and external), Data Memory (internal and ex-

ternal)andtheRegisterFile, which includesthecontrol

and status registers of theon-chip peripherals.

Two 16 bit MultiFunction Timers, each with an 8 bit

Prescaler and 13 operating modes allow simple

use for complex waveform generation and meas-

urement, PWM functions and many other system

timing functionsby the usage of the two associated

DMA channels for each timer. In addition there is

an 8 channel Analog to Digital Converter with inte-

gral sample and hold, fast 11

µs conversion time

and 8 bit resolution. An Analog Watchdog feature

is included for two input channels.

Completing the device is a full duplex Serial Com-

munications Interface with an integral 110 to

375,000 baud rate generator, asynchronous and

1.5Mbyte/s synchronous capability (fully program-

mable format) and associated address/wake-up

option, plus two DMA channels.

ST9040

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