SAA5291 datasheet(5/33 Pages) PHILIPS

Part #	SAA5291

Description	Economy teletext and TV microcontrollers

Download	33 Pages

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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5 / 33 page

February 1995

5

Philips Semiconductors

Preliminary speciﬁcation

One page Economy Teletext/TV

microcontroller

SAA5290

VSYNC

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.

VDDA

38

+5 V analog power supply.

VDDT

39

+5 V teletext power supply.

OSCGND

40

Crystal oscillator ground.

OSCIN

41

12 MHz crystal oscillator input.

OSCOUT

42

12 MHz crystal oscillator output.

RESET

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.

VDDM

44

+5 V microcontroller power supply.

P1.0/INT1

45

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

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

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

data port for the I2C-bus.

P1.1/T0

46

P1.2/INT0

47

P1.3/T1

48

P1.6/SCL

49

P1.7/SDA

50

P1.4

51

P1.5

52

SYMBOL

DESCRIPTION

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