[AK4709]
4. Blanking Control
The AK4709 supports Fast Blanking signals and Slow Blanking (Function Switching) signals for TV/VCR SCART.
■ Input/Output Control for Fast/Slow Blanking
FB1-0: TV Fast Blanking output control (07H: D1-D0)
FB1 bit
FB0 bit
TVFB pin Output Level
0V
2V< 3.0V(typ) at 150Ω load
Same as VCR FB input (2.5V/0V)
(Reserved)
0
0
1
1
0
1
0
1
(default)
Table 17. TV Fast Blanking output (Note: minimum load is 150Ω)
SBT1-0: TV Slow Blanking output control (07H: D3-D2)
SBT1 bit SBT0 bit TVSB pin Output Level
0
0
< 2V
4.73V <, < 7V
(Reserved)
10V <
(default)
0
1
1
1
0
1
Table 18. TV Slow Blanking output (Note: minimum load is 10kΩ)
SBV1-0: VCR Slow Blanking output control (07H: D5-D4)
SBV1 bit SBV0 bit VCRSB pin Output Level
0
0
< 2V
4.73V <, < 7V
(Reserved)
10V <
(default)
0
1
1
1
0
1
Table 19. VCR Slow Blanking output (Note: minimum load is 10kΩ)
SBIO1-0: TV/VCR Slow Blanking I/O control (07H: D7-D6)
SBIO1 bit SBIO0 bit
VCRSB pin Direction
Output
(Controlled by SBV1-0 bits) (Controlled by SBT1-0 bits)
(Reserved)
Input
(Stored in SVCR1-0 bits)
Input
TVSB pin Direction
Output
(default)
0
0
1
0
1
0
(Reserved)
Output
(Controlled by SBT1-0 bits)
Output
1
1
(Stored in SVCR1-0 bits)
(Same output as VCR SB)
Table 20. TV/VCR Slow Blanking I/O control
MS1319-E-00
2011/07
- 24 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
