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MTV121 Revision 5.0 06/29/1999

MTV121

MYSON

TECHNOLOGY

3.0 FUNCTIONAL DESCRIPTIONS

3.1 SERIAL DATA INTERFACE

The serial data interface receives data transmitted from an external controller. And there are 2 types of bus

3.1.1 SPI bus

While SSB pin is pulled to "high" or "low" level, the SPI bus operation is selected. And a valid transmission

should be starting from pulling SSB to "low" level, enabling mtv121 to receiving mode, and retain "low" level

until the last cycle for a complete data packet transfer. The protocol is shown in Figure 1.

PWM4

O

-

-

13

Open-Drain PWM D/A converter 4. The output pulse width is program-

mable by the register of Row 15, Column 27.

PWM5

O

-

-

14

Open-Drain PWM D/A converter 5. The output pulse width is program-

mable by the register of Row 15, Column 28.

PWM6

O

-

11

15

Open-Drain PWM D/A converter 6. The output pulse width is program-

mable by the register of Row 15, Column 29.

PWM7

O

-

12

16

Open-Drain PWM D/A converter 7. The output pulse width is program-

mable by the register of Row 15, Column 30.

VDD

-

9

13

17

Power supply. Positive 5 V DC supply for internal circuitry and a 0.1uF

decoupling capacitor should be connected across to VDD and VSS.

VFLB

I

10

14

18

Vertical input. This pin is used to input the vertical synchronizing signal.

It is leading triggered and has an internal pull-up resistor.

HTONE /

PWMCK

O

11

15

19

Half tone output / PWM clock output. This is a multiplexed pin selected

by PWMCK bit. This pin can be a PWM clock or used to attenuate R, G, B

gain of VGA for the transparent windowing effect.

FBKG

O

12

16

20

Fast Blanking output. It is used to cut off external R, G, B signals of

VGA while this chip is displaying characters or windows.

BOUT

O

13

17

21

Blue color output. It is a blue color video signal output.

GOUT

O

14

18

22

Green color output. It is a green color video signal output.

ROUT

O

15

19

23

Red color output. It is a red color video signal output.

VSS

-

16

20

24

Ground. This ground pin is used to internal circuitry.

Name

I/O

Pin No.

Descriptions

N16 N20 N24