ST9040 datasheet(38/56 Pages) STMICROELECTRONICS

38 / 56 page

Figure 3. ST90E40 Block Diagram

1.1 GENERAL DESCRIPTION

The ST90E40 and ST90T40 (following mentioned

as ST90E40)are EPROM members of the ST9 fam-

ilyof microcontrollers, in windowed ceramic (E) and

plastic OTP (T) packages respectively, completely

developed and produced by SGS-THOMSON Mi-

croelectronics using a n-well proprietary HCMOS

process.

The EPROM parts are fully compatible with their

ROM versions and this datasheet will thus provide

only information specific to the EPROM based de-

vices.

THE READER IS ASKED TO REFER TO THE

DATASHEET OF THE ST9040 ROM-BASED DE-

VICE FOR FURTHER DETAILS.

The EPROM ST90E40 may be used for the proto-

typing and pre-production phases of development,

and can be configured as: a standalone microcon-

troller with 16K bytes of on-chip EPROM, a micro-

controller able to manage external memory, or as a

parallel processing element in a system with other

processors and peripheral controllers.

The nucleus of the ST90E40 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 powerful I/O capabilities demanded by micro-

controller applications are fulfilled by the ST90E40

with up to 56 I/O lines dedicated to digital In-

put/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 memory, timer inputs and outputs, analog

inputs, external interrupts and serial or parallel I/O

with or without handshake.

CPU

1 6-Bit TIMER / WATCHDOG + SPI

SCI

WITH DMA

I/O POR T 7

(SC I )

256 Bytes

2 x 16-bit TIMER

W ITH DM A

I/O PORT 3

( TIMERS )

I/O PORT 0

( Address /Data )

I/O PORT 1

( Address )

512 Bytes

EEPROM

256 Bytes

RAM

16k Bytes

EPROM

I/O PORT 2

( SPI )

I/O PORT 4

( Ana log Inpu ts )

A/ D

CONVERTER

I/O PORT 5

WITH HANDSHAKE

MEMORY BUS

VR0A1385

INT0

INT7

ST90E40 - ST90T40

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