SAA5290 Просмотр технического описания (PDF) - Philips Electronics
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SAA5290 Datasheet PDF : 33 Pages
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Philips Semiconductors
One page Economy Teletext/TV
microcontroller
Preliminary specification
SAA5290
PINNING
SYMBOL
P2.0/TPWM
P2.1/PWM0
P2.2/PWM1
P2.3/PWM2
P2.4/PWM3
P2.5/PWM4
P2.6/PWM5
P2.7
P3.0/ADC0
P3.1/ADC1
P3.2/ADC2
P3.3
P3.4
VSSD1
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
VSSA
CVBS0
CVBS1
BLACK
IREF
FRAME
VSSD2
COR
RGBREF
B
G
R
VDS
HSYNC
PIN
DESCRIPTION
1
PORT 2: 8-bit open-drain bidirectional port with alternative functions. P2.0/TPWM is the
2
output for the 14-bit high precision PWM. P2.1/PWM0 to P2.6/PWM5 are the outputs for
3
the 6-bit PWMs 0 to 5.
4
5
6
7
8
9
PORT 3: 5-bit open-drain bidirectional port with alternative functions. P3.0/ADC0 to
10
P3.2/ADC2 are the inputs for the software ADC facility.
11
12
30
13
digital ground 1 for teletext and microcontroller circuits.
14
PORT 0: 8-bit open-drain bidirectional port. P0.5 and P0.6 have 10 mA current sinking
15
capability at 0.5 V for direct drive of LEDs.
16
17
18
19
20
21
22
analog ground.
23
Composite video input. A positive-going 1 V (peak-to-peak) input is required, connected
24
via a 100 nF capacitor.
25
Video black level storage input. This pin should be connected to VSSA via a 100 nF
capacitor.
26
Reference current input for analog circuits, connected to VSSA via a 27 kΩ resistor.
27
De-interlace output synchronized with the VSYNC pulse to produce a non-interlaced
display by adjustment of the vertical deflection currents.
28
Digital ground 2.
29
Open-drain, active LOW output which allows selective contrast reduction of the TV
picture to enhance a mixed mode display.
31
DC input voltage to define the output HIGH level on the RGB pins.
32
Dot rate character output of the BLUE colour information.
33
Dot rate character output of the GREEN colour information.
34
Dot rate character output of the RED colour information.
35
Video/data switch push-pull output for dot rate fast blanking.
36
Horizontal sync dedicated input for a TTL-level version of the horizontal sync pulse. The
polarity of this pulse is programmable by register bit TXT1.H POLARITY.
February 1995
4
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