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

876

5

0

HPOS OFFS ET

RE

FBE

VPOS OFFS ET

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 :

RE=1 :

the characters of the row are not displayed.

They are replaced by the page background color.

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

10

9876

543210

VZb1

VZb0

HZb1

HZb0

VZm1

VZm0

HZm1

HZm0

VZt1

VZt0

HZt1

HZt0

HZt[1:0]

: Top row horizontal zoom factor (ie row 0)

HZt[1:0] = 00

01

10

11

:

:

:

:

1 pixel per character dot

2 pixels per character dot

3 pixels per character dot

4 pixels per character dot

VZt[1:0]

: Top row vertical zoom factor

VZt[1:0] = 00

01

10

11

:

:

:

:

1 pixel per character line

2 pixels per character line

3 pixels per character line

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.

STV5730

8/19