STV5730A Datasheet, PDF (8/20 Pages) STMicroelectronics – MULTISTANDARD ON-SCREEN DISPLAY FOR VCR, PAY-TV, SATELLITE RECEIVER

STV5730A
FUNCTIONAL DESCRIPTION (continued)
1.3 - Row Attributes
There are 11 row attributes, numbered from 0 to 10. They may be written one by one or sequentially.
The row attribute format is as follows :
11
8
7
6
5
0
HPOS OFFSET
RE
FBE
VPOS OFFSET
VPOS OFFSET : the MSB is the sign bit (0 : positive, 1 : negative). If the offset is positive (from 0 to +17),
then the corresponding number of lines are added on top of the row (i.e. it moves
downwards). These extra lines are colored according to the character background
rules. If the offset is negative (from -1 to -17), then the corresponding number of lines
are subtracted from the display of the row.
FBE
: FBE=0 : the characters are displayed without border
FBE=1 : the characters are displayed with border
RE
: RE=0 : the characters of the row are not displayed.
They are replaced by the page background color.
RE=1 : the characters of the row are displayed.
HPOS OFFSET : The display of the row is shifted to the right by the corresponding number of pixels
(from 0 to 15).
1.4 - The Control Registers
There are 5 registers for microprocessor control. They can be written individually or sequentially :
- the ZOOM register
address : 12
- the COLOR register
13
- the CONTROL register
14
- the POSITION register
15
- the MODE register
16
1.4.1 - Zoom Register
11
VZb1
10
VZb0
9
HZb1
8
HZb0
7
6
5
4
VZm1 VZm0 HZm1 HZm0
3
VZt1
2
VZt0
1
HZt1
0
HZt0
HZt[1:0]
: Top row horizontal zoom factor (ie row 0)
HZt[1:0] = 00 : 1 pixel per character dot
01 : 2 pixels per character dot
10 : 3 pixels per character dot
11 : 4 pixels per character dot
VZt[1:0]
: Top row vertical zoom factor
VZt[1:0] = 00 : 1 pixel per character line
01 : 2 pixels per character line
10 : 3 pixels per character line
11 : 4 pixels per character line
HZm[1:0] : Same as HZt[1:0], for middle rows (ie rows 1 to 9)
VZm[1:0] : Same as VZt[1:0], for middle rows
HZb[1:0] : Same as HZt[1:0], for bottom row (ie row 10)
VZb[1:0] : Same as VZt[1:0], for bottom row
The output of this register is synchronized by the horizontal synchronism. The RESET message clears this
register.
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