z86131 ZiLOG Semiconductor, z86131 Datasheet - Page 45

• Manufacturer Part Number: z86131
• Description: Ntsc Line 21 Decoder
• Manufacturer: ZiLOG Semiconductor

ZiLOG
Note: In this product specification, one and two byte com-
The one byte commands provide a simple means of creating
OSD displays using preset screen formats built into the part.
These built-in modes provide the user with a simple way
to generate OSD screens. Two preset display modes are
available called POPSET and TEXTSET.
Using Popset
POPSET provides an OSD mode that operates in a fashion
similar to the Caption Pop-on mode. The POPSET com-
mand organizes the memory into two eight row blocks, one
visible on-screen and the other off-screen. An OSD screen
can then be created by loading the off-screen memory by
the command sequence POP ROW SEL, WRITE CHAR ..
W R I T E C H A R . . P O P R O W S E L . . W R I T E
CHAR .. WRITE CHAR. The data can then be presented
for on-screen display with the FLIP command.
The following is an example of a command sequence that
creates an OSD screen using the POPSET mode. It creates
a typical menu screen used in television receivers.
Note: In this document, commands are written as either a one-
In the sample program that follows, a comment field is writ-
ten following the command to describe the action of the
command or sequence of commands, where appropriate.
DS007200-TVX0199
mands are written as one or two, two-digit Hex values,
separated by a comma, within curly braces. For example,
the WRITE CHAR command for entering the letter “A”
as a single-width character would be presented in this
document as {A3,41}. This command would write the
letter “A” to the current cursor position of the display
row being addressed. Refer to the Serial Communica-
tions Interface and Commands sections, pages 24 and 29,
respectively, for further details.
or two-byte HEX value, separated by a comma, within
curly braces (for example, a two-byte OSD command is
{A1,00}).
P R E L I M I N A R Y
The comment field is identified by an asterisk (*); any text
following the asterisk is implied as a “comment” in the ex-
amples that follow.
Sample OSD Program
OSD
Command
{33}
{A0,02}
{A2,00}
{A3,08}
{A5,3e}
{A3,02}
{A5,56}
{A5,49}
{A5,44}
{A5,45}
{A5,4f}
{A0,04}
{A2,03}
{A3,02}
{A5,41}
{A5,55}
[A5,44]
[A5,49]
Note:
row 6 with double-wide characters. Spacing is obtained without
the A2 Cursor Set command to illustrate an alternate means of
column alignment.
*The next set of commands display the word ÒTIMEÓ in
Function
*Select POP mode. Sets up the Z86129
internal memory organization to support
POP mode. The Þrst block of commands
display > VIDEO in Double-Wide chars.
Each character is entered with the WRITE
CHARD command.
*Select POPROW 2, cursor at character
column1
*move cursor to 0
*PAC for RED chars written in PAC loca-
tion.
*Double-Wide char Ò>Ó displays in char col
1 & 2
*Green mid code written to char col 3
*ÒVÓ written to char col 4 & 5.
*ÒIÓ
*ÒDÓ
*ÒEÓ
*ÒOÓ
*The next block of commands display
AUDIO in row 4 double-width.
*select poprow 4, cursor in char col 1
*cursor to char col 3
*Green mid code written to char col 3
*ÒAÓ written to char col 4 & 5.
*ÒUÓ
*ÒDÓ
*ÒIÓ
NTSC Line 21 Decoder
Z86129/130/131
45