P83C266BDR datasheet(46/92 Pages) PHILIPS

46 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

17 ON-SCREEN DISPLAY (OSD)

17.1

Features

• Programmable active level polarity of VSYNC, HSYNC

and digital RGB with polarity selection

• Display RAM: 192 × 12 bits

• Display character fonts: 128 (126 customer fonts plus

2 reserved codes)

• One programmable vertical starting position counter

giving 63 different vertical starting positions

• One programmable horizontal starting position counter

giving 110 different horizontal starting positions

• Character size: 4 character sizes on a line-by-line basis

• Character matrix: 12 × 18 with no spacing between

characters

• Foreground colours: 8 on a character-by-character

basis

• Background/shadowing modes: Two primary modes:

TV mode and Frame mode on a frame basis. Each

primary mode has four sub-modes on a character row

basis:

– Sub-mode 1: Superimpose (no background)

– Sub-mode 2: North-West shadowing

– Sub-mode 3: Box background

– Sub-mode 4: Border shadowing.

• Background colours: 8 on a word-by-word basis.

Available when background is either in North-West

shadowing, Box background, Border shadowing and

Frame shadowing sub-modes.

• Display RAM starting address is programmable. Fast

switching between banks of display characters is

possible through software control.

• HSYNC driven PLL (frequency determined by SFR

OSPLL)

• Character blinking ratio: 1 : 1

• Character blinking frequency: programmable using

fVSYNC divisors of 32 and 64, on a character basis

• Display format: Flexible display format by using CR

(carriage return) and SP1, SP2 (space) and split space

code

• Display RAM address post increment each time new

data is written

• Vertical jitter cancelling circuit to avoid unstable VSYNC

leading edge mismatch with HSYNC signal

• OSD clock operating frequency: 4 to 12 MHz

• Meshing function.

17.2

Flexible display format

Figures 28 and 29 show typical examples of on-screen

displays generated by the P8xCx66.

There are 128 different fonts available two of which, the

Carriage Return (CR) code and the Space (SP) code, are

reserved for special functions. The CR code performs the

same function as the return key on a conventional

keyboard, the display will start on the next line. The SP

code enables the background colour of the space itself

and that of the following characters to be changed.

There are 192 display RAM locations (00H to BFH) and

these are considered as a linear addressed RAM. The first

character fetched is from the display RAM address pointed

to by the contents of the Special Function Register

OSSTART (see Section 17.3.5).

The OSD starting position is programmable, this is

described in detail in Section 17.2.1.

Two other registers are used to program the OSD:

OSCON and OSCON2. These registers are described in

Sections 17.3.2 and 17.3.6.

17.2.1

OSD STARTING POSITION

The horizontal and vertical starting position of the display

is controlled by two counters: SFRs OSORGH and

OSORGV.

OSORGH controls the horizontal starting position. This

counter is incremented every OSD clock cycle after the

falling edge of HSYNCP (after the polarity selection).

HSYNCP is always active HIGH. OSORGH is described in

Section 17.3.4.

OSORGV controls the vertical starting position. This

counter is incremented every HSYNC cycle and is reset by

the VSYNC signal. OSORGV is described in

Section 17.3.3.

The OSD starting position reference points are shown in

Fig.32.

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