ST92196A datasheet(135/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

Table 24. Underline Mode Control Bits Description

Note: Take care when changing (or stopping) un-

derline mode for a character, when the back-

ground color is displayed with “underline mode

change in the center of the character” (M bit in

Background palette).

In this case, the underline doesn’t stop at the end

of the character but stops in the middle of the fol-

lowing character. The underline color used is the

last background color displayed in the current pixel

line.

This always happens, when changing underline

mode in the following ways:

– From THICK to THIN or no underline

– From one THIN color to another when the under-

lining is not on the same line.

(THICK underline, in a 9 x 13 matrix, is underlining

on 2 lines and, in a 18 x 26 matrix, on 4 lines.

THIN underline, in a 9 x 13 matrix, is underlining

on 1 line and, in a 18 x 26 matrix, on 2 lines.)

Underline color for a 9x13 dot matrix

Underline color for a 18x26 dot matrix

No underline

Line 12: foreground color

Lines 23-24: foreground color

Line 13: underline color set 1

Lines 25-26: underline color set 1

Line 13: underline color set 2

Lines 25-26: underline color set 2

Line 12-13: underline color set 1

Lines 23-24-25-26: underline color set 1

Line 12-13: underline color set 2

Lines 23-24-25-26: underline color set 2

110

Line 12: underline color set 1; line 13: underline

color set 2

Lines 23-24: underline color set 1; lines 25-26:

underline color set 2

111

Line 12: underline color set 2; line 13: underline

color set 1

Lines 23-24: underline color set 2; lines 25-26:

underline color set 1

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