SAA5290 Просмотр технического описания (PDF) - Philips Electronics

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производитель

SAA5290

One page Economy Teletext/TV microcontroller

Philips Electronics 

Philips Semiconductors

One page Economy Teletext/TV

microcontroller

Preliminary specification

SAA5290

SYMBOL

VSYNC

VDDA

VDDT

OSCGND

OSCIN

OSCOUT

RESET

VDDM

P1.0/INT1

P1.1/T0

P1.2/INT0

P1.3/T1

P1.6/SCL

P1.7/SDA

P1.4

P1.5

PIN

DESCRIPTION

37

Vertical sync dedicated input for a TTL-level version of the vertical sync pulse. The

polarity of this pulse is programmable by register bit TXT1.V POLARITY.

38

+5 V analog power supply.

39

+5 V teletext power supply.

40

Crystal oscillator ground.

41

12 MHz crystal oscillator input.

42

12 MHz crystal oscillator output.

43

If the reset input is HIGH for 2 machine cycles (24 oscillator periods) while the oscillator

is running, the SAA5290 is reset. This pin should be connected to VDDM via a 2.2 µF

capacitor.

44

+5 V microcontroller power supply.

45

PORT 1: 8-bit open-drain bidirectional port with alternative functions. P1.0/INT1 is

46

external interrupt 1 which can be triggered on the rising and falling edge of the pulse.

47

P1.1/T0 is the counter/timer 0. P1.2/INT0 is external interrupt 0. P1.3/T1 is the

counter/timer 1. P1.6/SCL is the serial clock input for I2C-bus. P1.7/SDA is the serial

48

data port for the I2C-bus.

49

50

51

52

February 1995

5

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