ST6380B4 datasheet(56/82 Pages) STMICROELECTRONICS

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ST6380, ST6381, ST6382, ST6383, ST6388, ST6389

ON-SCREEN DISPLAY (Cont’d)

OSD Data RAM

The contents of the data RAM can be accessed by

the ST6388 MCU only when the Global Enable bit

(GE) in the Global Enable register is a zero.

The first character in every line is the format char-

acter. This character is not displayed. It defines

the size of the characters in the line and contains

the vertical space enable bit. This character also

defines the colour, background and display enable

for the first word in the line. Subsequent charac-

ters are either spaces or one of the 192 available

character types.

The space character defines the colour, back-

ground, display enable and horizontal space ena-

ble for the following word. Since there are 8 dis-

play lines of 20 characters each, the display RAM

must contain 8 lines x (20 characters + 1 format

character) or 168 locations. The RAM size is 168

locations x 8bits. The data RAM map is shown in

Table 20.

Table 20. OSD RAM Map

Notes: FT. The format character required for each line. Characters in columns1 through 20 are displayed.

Ch. (Byte) Character (Index into OSD character generator) or space character

Emulator Remarks

There are few differences between emulator and

silicon. For noise reasons, the OSD oscillator pins

are not available: the internal oscillator can not be

disabled and replaced by an external coil.

Column

...

1010

...

01010

...

00110

...

00001

...

00000

0000

...

0011111

LS1

LS0

LINE

...

AVAILABLE SCREEN SPACE

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