EF9345 datasheet(22/38 Pages) STMICROELECTRONICS

22 / 38 page

USED DEFINED CHARACTER GENERATOR IN MEMORY : DOR REGISTER

With 40 char / row, the elementary window dimen-

sions on the screen are 10 slices x 8 pixels. Thus,

a character cell holds 10 bytes in memory and 4

character cells are packed in one 40-byte buffer

(Figure 21). However, 5 bytes of a low resolution

quadrichrome cell are enough to fill up to window.

In this case, 8 character cells can be packed in one

40-byte buffer.

012 3 456 7

PIXELS

SLICE

NUMBER

(0 to 9)

ONE SLICE

ONE BYTE

7654

00000

010

SLICES ARE SHIFTTED LSB FIRST

4 CHARACTER CELLS

039

ONE

1K BYTE

BLOCK

Z block address

Character set base address

and

Character set number

MEMORY

C6 C5 C4 C3 C2 C1 C0

A CHARACTER SET LAYS IN ONE BLOCK

(up to 100 characters per set)

Slice number

(0 to 9)

SLICE

NUMBER

(0 to 4)

TWO SLICES

ONE BYTE (repeated)

C6 C5 C4 C3 C2 C1 C0

Character code C byte

(0 to 3 ; 32 to 127)

5432

210

NT*

NT* = 5k +NT

k = Subset index

A SPECIAL CASE : LOW RESOLUTION QUADRICHROME CELL (R = 1)

(up to 200 characters per set)

Figure 21 : Packing UDS Cells in Memory

EF9345

22/38

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