7220 datasheet(109/303 Pages) RENESAS

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7220 Group User’s Manual

FUNCTIONAL DESCRIPTION

2.11 CRT display function

2.11.4 Color registers

A display character color can be specified by setting a color to one of 4 color registers (CO0 to CO3:

addresses 00E616 to 00E916) and then by specifying the color register with the CRT display RAM.

There are 3 color outputs: R, G, and B. By a combination of these outputs, it is possible to set 23 – 1 (no

output) = 7 colors. However, since color registers are only 4, up to 4 colors can be displayed at one time.

R, G, and B outputs are set by bits 1 to 3 of the color register. Bit 5 is used to specify either a character

output or blank output. Figure 2.11.12 shows the color register.

Either character output or blank output is selected as the OUT1 pin output. Whether blank output or not

is selected as the OUT2 pin output.

Fig. 2.11.12 Color register n (addresses 00E616 to 00E916)

b7 b6 b5 b4 b3 b2 b1 b0

Color register n (CO0 to CO3) (n = 0 to 3) [Addresses 00E616 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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