[AK4709]
5. Monitor Options and INT function
■ Monitor Options (08H: D4-D0)
The AK4709 has several detection functions. SVCR1-0 bits, FVCR bit, VCMON bit and TVMON bit reflect the input
DC level of VCR slow blanking, the input DC level of VCR fast blanking and signals input to TVVIN or VCRVIN pins.
SVCR1-0: VCR Slow blanking status monitor
SVCR1-0 bits reflect the voltage at VCRSB pin only when the VCRSB is in the input mode.
When the VCRSB is in the output mode, SVCR1-0 bits hold previous value.
VCRSB pin input level
SVCR1 bit
SVCR0 bit
< 2V
4.5 to 7V
(Reserved)
9.5 <
0
0
1
1
0
1
0
1
Table 21. VCR Slow Blanking monitor
FVCR: VCR Fast blanking input level monitor
This bit is enabled when TVFB bit = “1”.
VCRFB pin input level
FVCR bit
< 0.4V
1V <
0
1
Table 22. VCR Fast Blanking monitor (Typical threshold is 0.7V)
VCMON: VCRVIN pin video input monitor (MCOMN bit = “1”),
TVVIN pin or VCRVIN pin video input monitor (MCOMN bit = “0”)
0: No video signal detected.
1: Detects video signal.
TVMON: TVVIN pin video input monitor (active when MCOMN bit = “1”)
0: No video signal detected.
1: Detects video signal.
AUTO
(00H D3)
MCOMN
(09H D7)
TVMON
(08H D4)
VCMON
(08H D3)
TVVIN signal
VCRVIN signal
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
x
x
x
x
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
1
1
0
0
0
0
0
1
1
1
0
1
0
1
0
1
1
1
(x: don’t care)
Note 28. TVVIN/VCRVIN signal: signal 0 = No signal applied, signal 1 = signal applied
Table 23. TV/VCR Monitor Function
MS1319-E-00
2011/07
- 25 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
