ST9294 データシートの表示（PDF） - STMicroelectronics

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ST9294

24K ROM HCMOS MCU WITH ON SCREEN DISPLAY AND CLOSED-CAPTION DATA SLICER

STMicroelectronics 

ST9294

GENERAL DESCRIPTION (Continued)

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 5.75µs 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

2V± 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.

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.

4/6

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