P83C366 datasheet(39/92 Pages) PHILIPS

39 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

For example, if the contents of VSTL = 000 0000, no

additional pulses are generated; if the contents of

VSTL = 111 1111, the number of additional pulses that are

generated is 127. Therefore, up to 127 additional pulses

can be added during a Tstd period. Additional pulses must

be distributed equally in one Tstd period (pulse distribution

procedure).

Figure 25 shows some examples of OUT2.

15.2.4

THE TPWM OUTPUT

If the contents of VSTH = 001 1101, and the contents of

VSTL = 000 0010, then the TPWM output is as shown in

Fig.26. The additional OUT2 pulses are generated in

subperiods 32 and 96.

Two extreme cases are worthy of further analysis:

• VSTH = 000 0000, and VSTL = 000 0000. No coarse

pulses will be generated and OUT1 is LOW for the whole

Tstd period. No fine pulses will be generated and

consequently TPWM is LOW for the whole Tstd period.

• VSTH = 111 1111 and VSTL = 111 1111. This value of

VSTH results in OUT1 being LOW for the first t0 period

but will go HIGH for the remaining 127

× t0 periods in the

Tsub cycle. This value of VSTL will generate

127 additional fine pulses (in every Tsub cycle except in

Tsub0). These additional fine pulses fill the gaps in the

OUT1 output (except in Tsub0). Consequently, the

TPWM output will be LOW for the first t0 period (Tsub0)

but will be HIGH for the remainder of the Tstd period.

Table 39 Additional pulse distribution

VSTL

CONTENTS

ADDITIONAL PULSE GENERATED

IN SUBPERIOD Tsubn

BINARY POSITION

TOTAL NUMBER OF

ADDITIONAL OUT2 PULSES

000 0000

−−

000 0001

100 0000

000 0010

32, 96

010 0000

000 0011

32, 64, 96

100 0000

010 0000

000 0100

16, 48, 80, 112

001 0000

000 0101

16, 48, 64, 80, 112

100 0000

001 0000

000 1000

8, 24, 40, 56, 72, 88, 104, 120

000 1000

001 0000

4, 12, 20, 28, 36, 44, 52, 60, ...116,

124

000 0100

010 0000

2, 6, 10, 14, 18, 22, 26, 30, ...122, 126

000 0010

100 0000

1, 3, 5, 7, 9, 11, 13, 15, ...125, 127

000 0001

111 1110

1, 2, 3, 4, ...62, 63, 65, 66, ...125, 126,

127

010 0000

001 0000

000 1000

000 0100

000 0010

000 0001

126

111 1111

1, 2, 3, 4, 5, 6, 7, ...125, 126, 127

100 0000

010 0000

001 0000

000 1000

000 0100

000 0010

000 0001

127

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