Figure 1-1. ST9293 Block Diagram

CPU

16-Bit TIMER / WATCHDOG + SPI

SLICE

TIMER

256 Bytes

REGISTER FILE

I/O PORT 0

8

256 to 768

RAM

16 to 48k x 8

ROM

I/O PORT 3

5

ON SCREEN

DISPLAY

PLL

HSYNC

PLLR

PLLF

VSYNC

3

I/O PORT 4

( Analog Inputs )

A/ D

CONVERTER

I/O PORT 2

( SPI )

8

I/O PORT 5

( Control Bus )

( Colour )

7

MEMORY BUS ( Address & Data )

REGISTER BUS ( Address & Data )

VR0B1749

AV

DD

ROM

RAM

J7

48K

768

J5

32K

640

J3

24K

512

J1

16K

256

1.1GENERAL DESCRIPTION

The ST9293 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 ROM parts are fully compatible with their

EPROM versions, which may be used for the pro-

totyping and pre-production phases of develop-

ment, and can be configured as standalone

microcontrollers with 48K/32K/24K/16 bytes of on-

chip ROM.

The nucleus of the ST9293 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

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 microcontroller appli-

cations are fulfilled by the ST9293 with up to 31/41

I/O lines dedicated to digital Input/Output.

These lines are grouped into up to six I/O Ports and

can be configured on a bit basis under software

control to provide timing, status signals, timer in-

puts and outputs, analog inputs, external interrupts

and serial or parallel I/O.

Three basic memory spaces are available to sup-

port this wide range of configurations: Program

Memory, Data Memory and the Register File,

which includes the control and status registers of

the on-chip peripherals.

The 16-bit Slice Timer with an 8-bit Prescaler and 6

operating modes allows simple use for wavefor-

mgeneration and measurement, PWM functions

and many other system timing functions.

The human interface is provided by the On Screen

Display module, this can produce up to 8 lines of of

up to 34 characters from a ROM defined 128 char-

acter set. The 9x13 character can be modified by 4

different pixel sizes, with character rounding, and

formed into words with colour and format attrib-

utes.

In addition there is a 4 channel Analog to Digital

Converter with integral sample and hold, fast 5.5

µs

conversion time and 6-bit guaranteed resolution.

®

ST9293

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