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5.2 Notes on programming for OSD (M37220M3-XXXSP/FP)

7220 Group User’s Manual

5-13

5.2 Notes on programming for OSD (M37220M3-XXXSP/FP)

The emulator MCU M37221ERSS is used for programming development with the M37220M3-XXXSP/FP.

However, the functions of the M37221ERSS are compatible with those of the M37221Mx-XXXSP/FP, and

therefore has some functions which the M37220M3-XXXSP/FP does not have. Note the following differences

when programming using the M37220M3-XXXSP/FP.

5.2.1 Setting of color registers

The color registers of M37220M3-XXXSP/FP are different from those of M37221ERSS (refer to “Figures

5.2.1 and 5.2.2”). Character background colors can be output when programming with the M37221ERSS,

but not with the M37220M3-XXXSP/FP mask version. This character background color program does not

operate on the M37220M3-XXXSP/FP and therefore, it cannot output character background colors (except

character background colors by OUT signal; bit 5).

Fig. 5.2.1 Color register n (M37221ERSS)

b7 b6 b5 b4 b3 b2 b1 b0

Color register n (CO0 to CO3) (n = 0 to 3) [Addresses 00E6 16 to 00E916]

Name

Functions

After reset R W

Color Register n

B signal output

selection bit (COn1)

0 : No character is output

1 : Character is output

G signal output

selection bit (COn2)

0 : No character is output

1 : Character is output

R signal output

selection bit (COn3)

0 : No character is output

1 : Character is output

B signal output (background)

selection bit (COn4)

0 : No background color is output

1 : Background color is output

OUT1 signal output

control bit (COn5)

0 : Character is output

1 : Blank is output

G signal output (background)

selection bit (COn6)

0 : No background color is output

1 : Background color is output

R signal output (background)

selection bit (COn7)

0 : No background color is output

1 : Background color is output

Nothing is assigned. This bit is a write disable bit.

When this bit is read out, the value is “0.”

(See note 1)

(See notes 1, 2)

(See note 2)

Notes 1: When bit 5 = “0” and bit 4 = “1,” there is output same as a character or border output

from the OUT1 pin.

Do not set bit 5 = “0” and bit 4 = “0.”

2: When only bit 7 = “1” and bit 5 = “0,” there is output from the OUT2 pin.

R—

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