PCA8516 datasheet(35/64 Pages) PHILIPS

35 / 64 page

1995 Mar 30

Philips Semiconductors

Preliminary speciﬁcation

Stand-alone OSD

PCA8516

9.11

Command A

Table 33 Command A format

Command A loads Control Register 4 with data that

determines the function of pin 2 (P04/ACM(VOB2)).

Table 34 Selection of P04 or ACM

9.12

Commands B, C and D

Table 35 Command B format

Table 36 Command C format

Table 37 Command D format

These three commands determine the vertical and

horizontal start positions of the display. 64 vertical and

64 horizontal start positions can be selected. After a

master reset, starting positions are not guaranteed and

therefore must be programmed by the user. The horizontal

start position (HP) and the vertical start position (VP) may

be calculated as follows:

Where (H5

→ H0) is the decimal value of these 6 bits and

(H5

→ H0) ≥ 4.

Where (V5

→ V0) is the decimal value of these 6 bits and

(V5

→ V0) ≥ 0.

BS1

BS0

76543210

01110

A/P

PIN FUNCTION

P04 is selected as an output port. Data is

written to this port using Command E. This is

also the default setting.

ACM function selected; can also be used as the

5th colour signal.

BS1

BS0

76543210

BS1

BS0

76543210

BS1

BS0

76543210

→

() 5

[] f

OSD

→

()

[] number of scan lines

9.13

Command E

When output ports P00, P01 and P04 are enabled,

Command E is used to write data to them.

Table 38 Command E format

9.14

Command F

Table 39 Command F format

This command loads Control Register 5 with data that

determines the background colour in Frame shadowing

mode.

9.15

Command G

Table 40 Command G format

Command G is used to enable/disable the OSD horizontal

stabilization circuit, to select the Half-tone mode and to

select the character size of the first line.

In the Half-tone mode, excellent semi-transparent

half-tone effects can be obtained with OSD frequencies in

the range 4 to 7 MHz. This mode also enhances the

background colour with intensity output. For further details

on the half-tone effect refer to the

“The programming guide

for the PCA8516” report number MICT/AN9402.

Table 41 Horizontal stabilization circuit control

Table 42 Selection of Half-tone mode

BS1

BS0

P04

P01

P00

BS1

BS0

76543210

0100

BS1

BS0

HM3 HT2

FS1

FS0

HM3

STATE OF STABILIZATION CIRCUIT

Stabilization circuit disabled (the default state).

Horizontal stabilization circuit enabled.

HT2

HALF-TONE MODE

Half-tone mode not selected (the default state).

Half-tone mode available when ACM bit = 1.

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