PCA8514 datasheet(35/64 Pages) PHILIPS

35 / 64 page

1995 Nov 27

Philips Semiconductors

Product speciﬁcation

Stand-alone OSD

PCA8514

9.11

Command A

Table 32 Command A format

Command A loads Control Register 4 with data that

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

Table 33 Selection of P04 or ACM

9.12

Commands B, C and D

Table 34 Command B format

Table 35 Command C format

Table 36 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

1001

BS1 BS0

76543210

1010

BS1 BS0

76543210

1011

→

() 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 37 Command E format

9.14

Command F

Table 38 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 39 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 programming guide for

the PCA8514”, report number MICT/AN9402.

Table 40 Horizontal stabilization circuit control

Table 41 Selection of Half-tone mode

BS1 BS0

P04

P01 P00

BS1 BS0

76543210

0100

BS1 BS0

7654

3210

0101

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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