ST9294 datasheet(4/6 Pages) STMICROELECTRONICS

4 / 6 page

Control of TV settings is able to be made with up to

eight 8-bit PWM outputs, with a frequency maxi-

mum of 23,437Hz at 8-bit resolution (INTCLK =

12MHz). Low resolutions with higher frequency op-

eration can be programmed.

In addition there is a 3 channel Analog to Digital Con-

verter with integral sample and hold, fast 5.75

µs con-

version time and 6-bit guaranteed resolution.

1.2 PIN DESCRIPTION

VSYNC.

Vertical Synch. Vertical video synchroni-

sation input to OSD. Positive or negative polarity.

HSYNC.

Horizontal Synch. Horizontal video syn-

chronisation input to OSD. Positive or negative po-

larity.

CCVideo.

Composite Video Input. Input to Data

Slicer for Closed Caption extraction, 1V

± 6dB or

± 3dB.

PLLF.

PLL Filter input. Filter input for the OSD for

PLL feed-back.

PLLR.

PLL Resistor connection pin. For resistor

connection to select the PLL gain adjust.

RESET.

Reset (input, active low). The ST9 is initial-

ised by the Reset signal. With the deactivation of RE-

SET, program execution begins from the Program

memory location pointed to by the vector contained

in program memory locations 00h and 01h.

GENERAL DESCRIPTION (Continued)

OSCIN, OSCOUT.

Oscillator (input and output).

These pins connect a parallel-resonant crystal

(24MHz maximum), or an external source to the

on-chip clock oscillator and buffer. OSCIN is the in-

put of the oscillator inverter and internal clock gen-

erator; OSCOUT is the output of the oscillator

inverter.

AVDD. Analog VDD of PLL. This pin must be tied to

VDD externally to the ST9294.

VDD. Main Power Supply Voltage (5V

±10%)

VSS. Digital Circuit Ground.

P0.0-P0.7,

P2.0-P2.5,

P3.0-P3.6,

P4.0-P4.7,

P5.0-P5.1 (J suffix)

P0.0-P0.7,

P1.0-P1.7,

P2.0-P2.5,

P3.0-P3.7,

P4.0-P4.7, P5.0-P5.3 (N suffix)

I/O Port Lines (In-

put/Output, TTL or CMOS compatible). 31/42 lines

grouped into I/O ports, bit programmable under

program control as general purpose I/O or as Alter-

nate functions (see next section).

P4.0 - P4.7 are high voltage (12V) open drain

1.2.1I/O Port Alternate Functions.

Each pin of the I/O ports of the ST9294 may as-

sume software programmable Alternative Func-

tions as shown in the Pin Configuration Drawings.

Table 1 shows the Functions allocated to each I/O

Port pin.

ST9294

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