7220 datasheet(112/303 Pages) RENESAS

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2-85

7220 Group User’s Manual

FUNCTIONAL DESCRIPTION

2.11 CRT display function

Fig. 2.11.16 Border selection register (address 00E516)

2.11.6 Character border function

An border of 1 clock (1 dot) equivalent size can be

added to a display character in both horizontal and

vertical directions. The border is output from pin

OUT 1. In this case, set bit 5 of a color register to

“0” (character is output).

Border can be specified each block by the border

selection register (address 00E516). Table 2.11.6

shows the relationship between the set values of

the border selection register and the character border

function. Figure 2.11.16 shows the border selection

Fig. 2.11.15 Border example

Table 2.11.6 Relationship between set value of border selection register and character border function

Border selection register

MDn0

Functions

Example of output

Ordinary

Border including

character

R, G, B output

OUT1 output

R, G, B output

OUT1 output

Border dots

Character

data dots

b7 b6 b5 b4 b3 b2 b1 b0

Border selection register (MD) [Address 00E516]

Name

Functions

After reset

R W

Border Selection Register

Block 1 OUT1 output

border selection bit (MD10)

0 : Same output as character output

1 : Border output

Indeterminate

Block 1 OUT1 output

border selection bit (MD20)

0 : Same output as character output

1 : Border output

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

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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