LC74731W-9818-E Просмотр технического описания (PDF) - ON Semiconductor

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LC74731W-9818-E

On-Screen Display Controller

ON Semiconductor 

LC74731W, LC74732W

COMMAND20 (Vertical display start position setup command)

• First byte

DA0 to 7

7

6

5

4

3

2

1

Register

—

—

—

—

—

—

RRM1

0

RRM0

State

1

0

1

0

0

0

0

1

0

1

Content

Function

Command 2 identification code

Vertical display position and vertical direction character size

settings

Extended command 0 identification code

RRM1

0

0

1

1

RRM0

0

1

0

1

Initial value (depends on IR)

1-2-1 1-2-2 1-2-3 Fixed

1-2-2 1-2-3 Fixed

1-2-3 Fixed

Notes

Continuous RAM write mode specification

• Second byte

DA0 to 7 Register

7

—

6

VP6

(MSB)

5

VP5

4

VP4

3

VP3

2

VP2

1

VP1

0

VP0

(LSB)

State

0

0

1

0

1

0

1

0

1

0

1

0

1

0

1

Content

Function

Second byte identification bit

If VS is the vertical display start position then:

6

VS = α + H × ( 2 ∑ 2 nV P n )

n=0

H: the horizontal synchronization pulse period

α = 20H (525H systems)

= 25H (625H systems)

HSYNC

VS

HS

Character display area

Notes

The vertical display start position is set by the 7 bits

VP0 to VP6.

The weight of bit 1 is 2H.

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