7220 Datasheet, PDF (210/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.5 Example of I²C-BUS control by software (M37220M3-XXXSP/FP)
(2) “CH UP/DOWN key“ input processing
CH UP/DOWN
To mute video and audio:
MUTE (D6 at sub-address 0B 16)←“1”
A MUTE (D6 at sub-address 01 16)←“1”
Related processings:
•Changing CH
•OSD when changing CH
•Write last data to E ²PROM
, etc.
Set the following (color system):
•3.58 (D2 at sub-address 09 16)
•NTSC (D1 at sub-address 02 16)
•SECAM (D0 at sub-address 09 16)
Wait for muting time
To release mute of picture and sound;
MUTE (D6 at sub-address 0B 16)←“0”
A MUTE (D6 at sub-address 01 16)←“0”
END
Fig. 5.5.14 Flowchart of “CH UP/DOWN key” input processing
7220 Group User’s Manual
5-37