
ASAHI KASEI 
[AK4707] 
MS0551-E-00 
2006/10 
- 21 - 
3.
Video Block 
Video Switch Control 
The AK4707 has switches for TV and VCR.  Each switch can be controlled via registers independently. When AUTO bit 
= “1” or STBY bit = “1”, these switches setting is ignored and set to fixed configuration (loop-through mode). Refer the 
auto setup mode and standby mode.
(04H: D2-D0)
Source of 
TVVOUT pin 
Shutdown 
000 
(Hi-Z) 
ENCV pin 
(Encoder CVBS)
ENCV pin 
(Encoder Y) 
ENCY pin 
(Encoder Y) 
VCRVIN pin 
(VCR CVBS) 
TVVIN pin 
(TV CVBS) 
(Reserved) 
110 
- 
(Reserved) 
111 
- 
Table 7. TV video output (Refer Note 18.) 
(04H: D5-D3)
Mode 
VTV2-0 bit 
Source of 
TVRC pin 
(Hi-Z) 
ENCRC pin 
(Encoder Red,C)
ENCRC pin 
(Encoder C) 
ENCC pin 
(Encoder C) 
VCRRC 
(VCR Red,C) 
Source of 
TVG pin 
(Hi-Z) 
ENCG pin 
(Encoder Green) 
Source of 
TVB pin 
(Hi-Z) 
ENCB pin 
(Encoder Blue)
Encoder CVBS /RGB 
001 
Encoder Y/C 1 
010 
Hi-Z 
(Hi-Z) 
Encoder Y/C 2 
011 
Hi-Z 
(Hi-Z) 
VCR (default) 
100 
VCRG pin 
(VCR Green) 
VCRB pin 
(VCR Blue) 
TV CVBS 
101 
(Hi-Z) 
(Hi-Z) 
(Hi-Z) 
- 
- 
- 
- 
- 
- 
Mode 
VVCR2-0 bit
Source of  
VCRVOUT pin
(Hi-Z) 
ENCV pin 
(Encoder CVBS) 
ENCY pin 
(Encoder CVBS) 
TVVIN pin 
(TV CVBS) 
VCRVIN pin 
(VCR CVBS) 
- 
- 
- 
Shutdown 
000 
Encoder CVBS or Y/C 1
001 
Encoder CVBS or Y/C 2
010 
TV CVBS (default) 
011 
VCR 
100 
(Reserved) 
(Reserved) 
(Reserved) 
Table 8. VCR video output (Refer Note 18.) 
101 
110 
111 
Note 18. When input the video signal via ENCRC pin or VCRRC pin, set CLAMP1-0 bits respectively.