7220 datasheet(207/303 Pages) RENESAS

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5-34

APPLICATION

5.5 Example of I2C-BUS control by software (M37220M3-XXXSP/FP)

7220 Group User’s Manual

5.5.5 Data setting according to key processing

Examples of the M52340SP settings, corresponding to each actual TV set key input, are described below.

(1)

“Power ON/OFF key” input

When power supply is supplied to the

M52340SP by this input, the data is set to all

registers (at sub-addresses “0016” to “1316”).

(2)

“Tuning and search-related keys” (CH

UP/DOWN key, CH direct selection key) input

When tuning, the color system data (refer to

“Table 5.5.10”) is set according to the

determination result of the color system by

the status data register (refer to “Table 5.5.1”).

Also, the corresponding data is set when the

color system search-related keys are input.

However, note that the above-mentioned setting

is valid only when setting AUTO (bit 5 at sub-

address 0616, write data) to “0.” When setting

to “1,” the data is automatically set inside the

M52340SP.

When tuning, the data is set as shown in Table

5.5.1.

(3)

“Volume UP/DOWN key” input

When the volume up/down key is input, the

data is set as shown in Table 5.5.2.

(4)

“Screen-size-related keys” input

When the screen-related keys are input on

TVs with various screen sizes (wide aspect

TV, etc.), the screen size data and position

data is set as shown in Table 5.5.3. Also, the

data of each frequency (50 Hz or 60 Hz) is

occasionally held.

(5)

“Picture data control key” and “Picture

memory switching key” input

When changing picture data, the data is set

to the corresponding write data register as

shown in Table 5.5.4.

Table 5.5.1 Data setting at tuning and searching

Sub-address

0216

0616

Bit

D0, D1

Data

TRAP

DBF

DFA

DL TIME

Sub-address

0316

Bit

D0 to D6

Data

AUDIO ATT

Table 5.5.2 Data setting at “volume UP/DOWN key”

input

Table 5.5.3 Data setting at “screen-size-related

keys” input

Sub-address

0916

Bit

D3 to D6

Data

H PHASE

Table 5.5.4 Data setting at “picture data control

key” and “picture memory switching

key” input

Sub-address

0416

0516

0716

0816

0A16

Bit

D0 to D5

D0 to D6

Data

SHARPNESS

CONTRAST

TINT

COLOR

BRIGHT

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