ST6391 datasheet(53/68 Pages) STMICROELECTRONICS

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Background Control Register

This register sets up two possible backgrounds.

The background select bit (BGS) in the format or

space character will determine which background

is selected for the current word.

R1,R0,G1,G0,B1,B0. Background Colour.

These bits define the colour of the specified back-

ground, either background 1 or background 0 as

defined in Table below.

Table 14. Background Register Colour

Setting.

Colour

Black

Blue

Green

Cyan

100

Red

Magenta

Yellow

White

BK1,BK0. Background Enable.These bits deter-

mine if the specified background is enabled or not.

“0” -The following word does not have a 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.

OSD Data RAM

The contents of the data RAM can be accessed by

the ST639x 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 in

Table 15.

ON-SCREEN DISPLAY (Continued)

BCR

Backround Control Register

(14h - Page 6, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

BK0 = Backround Enable Bit 0

BK1 = Backround Enable Bit 1

B0 = B Colour Backround Bit 0

B1 = B Colour Backround Bit 1

G0 = G Colour Backround Bit 0

G1 = G Colour Backround Bit 1

R0 = R Colour Backround Bit 0

R1 = R Colour Backround Bit 1

Figure 64. Backround Control Register

CBSR

Character Bank Select Register

(EDh - No Page , Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

BS = Bank Select Bit

Unuse d

Figure 65. Character Bank Select Register

ST6391,92,93,95,97,99

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