P83C266BDR datasheet(69/92 Pages) PHILIPS

69 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

17.16 FB to RGB delay compensation

The P8xCx66 is connected to an analog video mixer. In the past analog mixers had different delays between FB and

RGB. To compensate for these differences, FB to RGB delay compensation is implemented on-chip. The delay time is

selected using the OSFBD register.

The delay compensation can be done with a resolution of 1

⁄2fOSC. The OSC clock runs at 4 times the OSD clock

frequency for OSD frequencies from 4 up to 6.75 MHz, and at 2 times the OSD clock frequency from OSD frequencies

from 6.75 MHz up to 12 MHz. At 4 MHz the delay unit is 33 ns, at 6.5 MHz the delay unit is 19 ns, at 8 MHz the delay

unit is 33 ns, at 10 MHz the delay unit is 25 ns and at 12 MHz the delay unit is 21 ns.

17.16.1 OSD FB DELAY REGISTER (OSFBD)

Table 79 OSD FB Delay Register (SFR address C7H)

Table 80 Description of OSFBD bits

Table 81 Selection of FB to RGB delay

76543210

−−−

FBD3

FBD2

FBD1

FBD0

BIT

SYMBOL

DESCRIPTION

7to5

−

These 3 bits are not used.

−

This bit must be set to a logic 0. If set to a logic 1, the character font will come from

internal logic instead of character ROM.

3 to 0

FBD3 to FB

FB to RGB delay select. These 4 bits select the delay unit multiple that will determine

the delay time between FB and RGB; see Table 81.

FBD3

FBD2

FBD1

FBD0

DECIMAL

VALUE

FB to RGB DELAY

1111

−7

Delay RGB with 7 units in relation to FB.

1110

−6

Delay RGB with 6 units in relation to FB.

1101

−5

Delay RGB with 5 units in relation to FB.

1100

−4

Delay RGB with 4 units in relation to FB.

1011

−3

Delay RGB with 3 units in relation to FB.

1010

−2

Delay RGB with 2 units in relation to FB.

1001

−1

Delay RGB with 1 units in relation to FB.

10000

Delay RGB with 0 unit in relation to FB.

0000

Delay FB with 0 unit in relation to RGB.

0001

Delay FB with 1 unit in relation to RGB.

0010

Delay FB with 2 units in relation to RGB.

0011

Delay FB with 3 units in relation to RGB.

0100

Delay FB with 4 units in relation to RGB.

0101

Delay FB with 5 units in relation to RGB.

0110

Delay FB with 6 units in relation to RGB.

0111

Delay FB with 7 units in relation to RGB.

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