ST63140 datasheet(55/86 Pages) STMICROELECTRONICS

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BK1,BK0. Background Enable.These bits deter-

mine if the specified background is enabled or not.

“0” -The following word doesnot havea background.

“1” -There is a background around the following

word.

D7-D1. These bits are not used

BS. Bank Select. This bit select the character bank

to be used. The lower bank is selected with 0. The

value can be modified only when the OSD is OFF

(GE=0). No reset value.

CBSR

Character Bank Select Register

(EFh - No Page , Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

BS = Bank Select Bit

Unused

Figure 67. Character Bank Select Register

ON-SCREEN DISPLAY (Continued)

OSD Data RAM

The contents of the data RAM can be accessed by

the ST631xx 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 de-

fines the colour, background and display enable for

the first word in the line. Subsequent characters

are either spaces or one of the 64 available charac-

ter types.

The space character defines the colour, back-

ground, display enable and horizontal space en-

able for the following word. Since there are 5

display lines of 15 characters each, the display

RAM must contain 5 lines x (15 characters + 1 for-

mat character) or 80 locations. The RAM size is 80

locations x 7 bits. The data RAM map is shown

inTable 12.

ST63140,142,126,156

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