P83C366 datasheet(49/92 Pages) PHILIPS

49 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

17.3

OSD registers

17.3.1

OSD DEFAULT REGISTER (OSDDEF)

This register is used to set the default values for background colour, character size and sub-mode after each VSYNC

pulse. After a system reset OSDDEF holds 22H. These values can be changed by writing new data to OSDDEF or by

starting the screen with a space code (SP1 or SP2) and a CR code.

Table 49 OSD Default Register (SFR address 9CH)

Table 50 Description of OSDEF bits

Table 51 Default sub-mode selection

The default value of OSDDEF gives the following initial settings:

• Character size = 1 horizontal line/1 DOSC (Fig.31)

• Background colour = blue (R = G = 0, B = 1)

• Sub-mode = Box background mode.

76543210

−

BIT

SYMBOL

DESCRIPTION

Default background colour. These 3 bits select the default background colour.

−

This bit is reserved for future use (intensity output).

3SV

Default character size. If SV = 0, then the vertical dot size is equal to one horizontal

line. If SV = 1, then the vertical dot size is equal to two horizontal lines.

2SH

Default horizontal dot size. If SH = 0, then the horizontal dot size is equal to one OSD

clock. If SH = 1, then the horizontal dot size is equal to two OSD clocks.

1M1

Default sub-mode selection. These 2 bits select the default sub-mode; see Table 51.

0M0

SUB-MODE

Superimpose mode selected.

North-West shadowing mode selected.

Box background mode selected.

Border shadowing mode selected.

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