7220 datasheet(187/303 Pages) RENESAS

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

7220 Group User’s Manual

5-14

Fig. 5.2.2 Color register n (M37220M3-XXXSP/FP)

b7 b6 b5 b4 b3 b2 b1 b0

Color register n (COn) (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

OUT signal output

control bit (COn5)

0 : Character is output

1 : Blank is output

6, 7

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

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

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

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

Nothing is assigned. These bits are write disable bits.

When these bits are read out, the values are “0.”

R—

5.2.3 Number of display characters

The M37221ERSS can display up to 24 characters in each block. However, the M37220M3-XXXSP/FP can

display only up to 20 characters in each block. Note this when programming using the M37220M3-XXXSP/

FP.

5.2.2 Setting border selection register

The M37220M3-XXXSP/FP can output neither character background (OUT) nor border at the same time.

When setting the border selection bits (bit 0 or 2) to “1,” the border output takes over OUT (setting of

bit 5 of the color registers). Therefore, select either the character background output or the border output.

Fig. 5.2.3 Border selection register (M37220M3-XXXSP/FP)

b7 b6 b5 b4 b3 b2 b1 b0

Border selection register (MD) [Address 00E5 16]

Name

Functions

After reset

R W

Border Selection Register

Block 1 OUT output

border selection bit (MD10)

0 : Same output as character output

1 : Border output

Indeterminate

Block 2 OUT output

border selection bit (MD20)

0 : Same output as character output

1 : Border output

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

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

Nothing is assigned. These bits are write disable bits.

When these bits are read out, the values are “0.”

Indeterminate

R—

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