STV6412A(2003) データシートの表示（PDF） - STMicroelectronics

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STV6412A
(Rev.:2003)

AUDIO/VIDEO SWITCH MATRIX

STMicroelectronics 

STV6412A

Table 18. RF & Miscellaneous Control

Reg.

Addr

(Hex)

Description

Data

Bits

d7 d6 d5 d4 d3 d2 d1 d0

Comments

R/C TV Output Selection

1

X X X X X X X 0 Red signal selected

X X X X X X X 1 Chroma signal selected

RF Output: Adder control

2

and chroma sub-carrier filter

selection

X X X X X X 0 X CVBS to RF output

X X X X X X 1 X Y + C to RF output

X X X X X 0 X X Filter not active

X X X X X 1 X X Filter active

04 C_Gate Output Control

1 X X X X 0 X X X High level

X X X X 1 X X X Low level

C_VCR Output Control

1 X X X 0 X X X X Tri-state mode (high impedance)

X X X 1 X X X X Active

Slow Blanking Mode

1 X 0 X X X X X X Normal Mode

X 1 X X X X X X SLB TV is driven by SLB VCR

IT Enable

1 0 X X X X X X X No interrupt flag

1 X X X X X X X IT enable

Table 19. Slow Blanking & Inputs Control

Reg.

Addr

(Hex)

Description

Data

Bits

d7 d6 d5 d4 d3 d2 d1 d0

Comments

Encoder R/Csub Clamp

1 X X X X X X X 0 Bottom level clamp

X X X X X X X 1 Average level clamp

VCR R/Csub Clamp

1 X X X X X X 0 X Bottom level clamp

X X X X X X 1 X Average level clamp

Encoder Input Level Adjust- 2

ment

05

2

Slow Blanking TV SCART

X X X X 0 0 X X 0 dB for normal audio inputs

X X X X 0 1 X X +6 dB for weak audio inputs

X X X X 1 0 X X +9 dB for weak audio inputs

X X 0 0 X X X X Input mode only

X X 0 1 X X X X Output < 2 V

X X 1 0 X X X X Output 16/9 format

X X 1 1 X X X X Output 4/3 format

2

Slow Blanking VCR SCART

0 0 X X X X X X Input mode only

0 1 X X X X X X Output < 2 V

1 0 X X X X X X Output 16/9 format

1 1 X X X X X X Output 4/3 format

16/24

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