ST6387 datasheet(53/84 Pages) STMICROELECTRONICS

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ST6365, ST6375, ST6385 ST6367, ST6377, ST6387

ON-SCREEN DISPLAY (Cont’d)

OSD Data RAM

The contents of the data RAM can be accessed by

the ST638x MCUs 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 64 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 5 dis-

play lines of 15 characters each, the display RAM

must contain 5 lines x (15 characters + 1 format

character) or 80 locations. The RAM size is 80 lo-

cations x 7 bits. 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 columns 1 through 15 are displayed.

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

Column

010

101

110

100

110

011

000

011

111

Page

LINE

AVAILABLE SCREEN SPACE

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