AK4703 Datasheet, PDF (20/38 Pages) Asahi Kasei Microsystems – AV SCART switch

ASAHI KASEI
AKM CONFIDENTIAL
[AK4703]
5. Monitor Options and INT function
„ Monitor Options (08H: D4-D0)
The AK4703 has several monitors for 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 bits, FVCR bit, VCMON bit and TVMON bit are reflected to
these values.
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
0
0
4.5 to 7V
(Reserved)
0
1
1
0
9.5 <
1
1
Table 15. 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
0
1V <
1
Table 16. VCR Fast Blanking monitor (Typical threshold is 0.7V)
VCMON: VCR input monitor
0: No video signal detected via VCRVIN pin.
1: Detects video signal via VCRVIN pin.
TVMON: TV input monitor
0: No video signal detected via TVVIN pin.
1: Detects video signal via TVVIN pin.
Rev. 0.1
- 20 -
2004/03