ST92196A datasheet(239/268 Pages) STMICROELECTRONICS

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ST92E196A/B & ST92T196A/B GENERAL DESCRIPTION

INTRODUCTION (Cont’d)

1.1.4 On-chip Peripherals

OSD Controller

The On Screen Display displays closed caption or

extended service format data received from the

on-chip data slicers or any text or menu data gen-

erated by the application. Rows of up to 63 charac-

ters can be displayed with two user-definable

fonts. Colors, character shape and other attributes

are software programmable. Support is provided

for mouse or other pointing devices.

Parallel I/O Ports

The ST9 is provided with dedicated lines for input/

output. These lines, grouped into 8-bit ports, can

be independently programmed to provide parallel

input/output or to carry input/output signals to or

from the on-chip peripherals and core e.g. SCI and

Multifunction Timer. All ports have active pull-ups

and pull-down resistors compatible with TTL

loads. In addition pull-ups can be turned off for

open drain operation and weak pull-ups can be

turned on to save chip resistive pull-ups. Input

buffers can be either TTL or CMOS compatible.

Multifunction Timer

The multifunction timer has a 16-bit Up/Down

counter supported by two 16-bit Compare regis-

ters and two 16-bit input capture registers. Timing

resolution can be programmed using an 8-bit pres-

caler.

Serial Communications Controller

The SCI provides an asynchronous serial I/O port

using two DMA channels. Baud rates and data for-

mats are programmable. Controller applications

can further benefit from the self test and address

wake-up facility offered by the character search

mode.

I2C Bus Interface

The I2C bus is a synchronous serial bus for con-

necting multiple devices using a data line and a

clock line. Multimaster and slave modes are sup-

ported. Up to four channels are supported. The I2C

interface supports 7-bit addressing. It operates in

multimaster or slave mode and supports speeds of

up to 666.67 kHz. Bus events (Bus busy, slave ad-

dress recognised) and error conditions are auto-

matically flagged in peripheral registers and inter-

rupts are optionally generated.

Analog/Digital Converter

The ADC provides up to 8 analog inputs with on-

chip sample and hold. Conversion can be trig-

gered by a signal from the MFT.

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