STV9427 datasheet(10/20 Pages) STMICROELECTRONICS

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III - Code Format

The codes of STV9427/28/29 are all single byte

codes. There are basically 3 kinds of code :

- The control codes from 0 to 27 (00h to 1Bh) and

from 224 to 239 (E0h to EFh).

- The ROM character codes from 32 to 223 (20h to

DFh) and from 240 to 255 (F0h to FFh).

- The user definables characters codes from 240

to 254 (F0h to FFh).

Each row must begin with a displayable character

code followed by a NOP or any control code.

For code definition see Table 4.

III.1 - Control Codes

Control codes must be followed by a displayable

code (from 32 to 223), except for RTN & EOL. They

must not be used twice consecutively without a

displayable code between them.

The control code CALL is preceded by an address

byte.

The control codes are not displayed except if men-

tioned.

Code 0 (00h)

: NOP : no operation and no display is

performed, can be used to spare a

location in RAM for an active control

code.

Codes 1 to 7

(01h to 07h)

: SYMETRIES :

TSHS(01) Top Side Horizontal

Symetry code displays the top half

side of the following displayable code

symetricaly to the bottom side.

BSHS(02) Bottom Side Horizontal

Symetry code displays the bottom half

side of the following displayable code

symetricaly to the top side.

HFLIP(03) Horizontal Flip code flips

horizontaly the following displayable

code.

LSVS(04) Left Side Vertical Symetry

code displays the left half side of the

following

displayable

code

symetricaly to the right side.

RSVS(05) Right Side Vertical symetry

code displays the right half side of the

following

displayable

code

symetricaly to the left side.

VFLIP(06) Vertical Flip code flips

verticaly the following displayable

code.

HVFLIP(07) Horizontal & Vertical Flip

code flips horizontaly and verticaly the

following displayable code.

Codes 8 (08h)

(at odd @)

: RTN : return to the CALL + 1 code

location (see Note).

Code 09 to 14

(09h to 0Eh)

: Reserved

Code 15 (0Fh)

: EOL, end of line terminates the

display of the current row.

Codes 16 to 23

(10h to 17h)

: COL0 to COL7 codes select 1 byte

among 8 within the CLUT in RAM. The

block selection is fixed by CLU3 bit of

the active character descriptor (see

Table 1 and Table 2).

Codes 24 to 27

(18h to 19h)

: CALL, these control codes switch the

display of the next character to the

code address given by the next byte

as following :

CALL CODE

(odd @) MSB

000

1100

ADDRESS BYTE

(even @) LSB

A[9:1]

: Address of the next code to be used (A0 = 0 only even

addresses).

Notes :

CALL and RTN code must be used twin. They cannot be nested.

CALL and RTN codes are displayed as a SPACE character.

CALL and RTN codes must be placed at odd addresses. They may

be preceed by a NOP in order to place them at the right position.

Codes 28 to 31

(1Ch to 1Fh)

: Reserved

Code 224 to 239

(E0h to EFh)

: Accent shapes from 224 to 239 (E0h

to EFh) are used combined with all

other character codes 32 to 223 (10h

to DFh) and placed before the target

character.

The first set of accents, 224 to 231 (E0h

to E7h) must be used with lower case

letters. The 5 upper slices of the target

character are replaced by the accent

shape.

The second set of accents, 232 to 239

(E8h to EFh) must be used with the

upper case letters (capital letters). The

3 upper slices of the target character

are replaced by the accent shape.

Accent code must always be followed

by a displayable character or a space.

III.2 - ROM Character Codes

Codes 32 to 223

(20h to DFh) and

Codes 240 to 254

(F0h to FEh)

: ROM

character

shapes

ar e

described as 12x18 pixel matrix as

shown in Table 5.

It comprises 60 logos dedicated for

monitor application (Horizontal

position, keystone, ...), 25 characters

for horizontal bar-graph an d

additional shapes.

FUNCTIONAL DESCRIPTION (continued)

STV9427 - STV9428 - STV9429

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