ST92196A datasheet(142/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

8.5.8.2 Horizontal Shift and Row Character Count

Address in Segment 22h: 2p + 2 (Bits 15:8), 2p + 3 (Bits 7:0). See Figure 59.

For each row to be displayed, the number of char-

acters in the row, and the horizontal position of the

row on the screen need to be specified.

Let’s assume that the start address of the current

row buffer is 2p (even address).

Bits 15:10 = RCN[5:0]

Row Character Count

These bits define the number of characters to dis-

play in the current row.

The Display controller allows to display from 1 to

63 characters (in parallel mode) or 61 (in serial

mode, as the first 2 bytes are taken as attributes)..

For example, a 36 character row requires pro-

gramming RCN[5:0] = 24h.

Bits 9:0 = HS[9:0]

Horizontal Shift

These bits define the horizontal shift value. They

specify, in terms of number of Pixel clock periods,

the horizontal shift applied from the leading edge

of the Hsync pulse to the beginning of the first dis-

played character (1st character in parallel modes,

3rd character in serial mode). Refer to Figure 65.

Loading any value smaller than 01h is forbidden.

The result is given by the formula:

Horizontal shift = [HS[9:0]+ 47] * (2*PIXCLK)

(where PIXCLK is the clock issued from the Skew

Corrector). Refer to the Timing and Clock Control

chapter for programming information.

Figure 65. Row Position

RCN5

RCN4

RCN3

RCN2

RCN1

RCN0

HS9

HS8

HS7

HS6

HS5

HS4

HS3

HS2

HS1

HS0

ST92x196

Displayed Row

Event Line (Vertical Shift)

Horizontal

Shift

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