ST9 datasheet(8/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

2.2 PERIPHERALS

The ST9 family includes a large number of peripherals. The main ones are:

These peripherals are available with the standard variants. More peripherals are available on

custom devices on request, e.g. a videotext decoding logic.

The ST9 family includes so many variants it would go beyond the scope of this book to de-

scribe them all. They are all made up of the same ST9 core surrounded by a set of peripherals,

ROM and/or RAM and/or EEPROM and/or FLASH being optional. This book has chosen to

show the three most generic variants and provide a basis for understanding all the others.

Acronym

Name

Function

MFT

Multi-Function Timer

All counting and timing functions. Includes auto-reload on con-

dition, interrupt generation, DMA transfer, two inputs for fre-

quency measurement or pulse counting, two outputs that can

change on condition, PWM signal generation.

Conditions include: overflow/underflow, comparison with one

or two compare registers.

Capture registers used to record transitions on inputs with their

time of occurrence.

SCI-M

Serial Communication In-

terface

Asynchronous transfer with either internal bit-rate generation or

an external clock. Parity generation/detection. Address recog-

nition feature that can request an interrupt on match of an input

character. DMA transfer.

WDT

Watchdog timer

Can be used either as a watchdog or as a timer with input and

output capable of pulse counting or waveform generation.

I/O port

Parallel input/output port

Parallel input/output ports. Each bit individually configurable as

input, output, bi-directional, or alternate function. Inputs can be

high impedance or with pull-up, CMOS or TTL-level. Outputs

can have open drain or push-pull configuration.

ADC

Analog to digital converter.

10-bit analog to digital converter. One to sixteen channels can

be converted in series. On each of two of the sixteen channels,

an Analog Watchdog function is used to define two thresholds.

When exceeded, an interrupt is generated.

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