7220 datasheet(104/303 Pages) RENESAS

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2-77

7220 Group User’s Manual

2.11 CRT display function

Fig. 2.11.8 Character size register (address 00E416)

Note: The display start position in the horizontal direction is not affected by the character size. In other

words, the horizontal display start position is common to all blocks even when the character size

varies with each block (refer to “Figure 2.11.9”).

Fig. 2.11.9 Display start position (horizontal

direction) for each character size

2.11.2 Character size

The size of characters to be displayed can select from 3 sizes for each block. Set a character size by the

character size register (address 00E416).

The character size in block 1 can be specified by bits 0 and 1 of the character size register; the character

size in block 2 can be specified by bits 2 and 3. Figure 2.11.8 shows the character size register.

The character size can select three sizes: minimum

size, medium size, and large size. Each character

size is determined with the number of scanning lines

in the height (vertical) direction and the oscillation

cycle for display (= TC) in the width (horizontal)

direction.

The minimum size consists of [1 scanning line] ! [1

TC]; the medium size consists of [2 scanning lines]

! [2 TC]; and the large size consists of [3 scanning

lines] ! [3 TC]. Table 2.11.2 shows the relationship

between the set values in the character size register

and the character sizes.

Table 2.11.2 Relationship between set value in character size register and character sizes

Width (horizontal) direction

TC: oscillation cycle for display

1 TC

2 TC

3 TC

Height (vertical) direction

scanning lines

1 line

2 lines

3 lines

Set values in character size register

CSn1

CSn0

Minimum

Medium

Large

Character size

This is not available.

b7 b6 b5 b4 b3 b2 b1 b0

Character size register (CS) [Address 00E4 16]

Name

Functions

After reset

R W

Character Size Register

0, 1 Character size of block 1

selection bits

(CS10, CS11)

00 : Minimum size

01 : Medium size

10 : Large size

11 : Do not set.

Indeterminate

2,3

Character size of block 2

selection bits

(CS20,CS21)

00 : Minimum size

01 : Medium size

10 : Large size

11 : Do not set.

Nothing is assigned. These bits are write disable bits.

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

Indeterminate

R—

Minimum size

Medium size

Large size

Display start

position

FUNCTIONAL DESCRIPTION

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