7220 datasheet(162/303 Pages) RENESAS

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M37220M3-XXXSP/FP

4.5 Functional description

7220 Group User’s Manual

4-24

The different CRT display function–related registers from those of M37221M6-XXXSP/FP are shown in the

following pages.

Fig. 4.5.13 Border selection register (addresses 00E516)

Fig. 4.5.14 Color register n (addresses 00E616 to 00E916)

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—

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 1 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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