Z8622912PSC View Datasheet(PDF) - Zilog
Part Name
Description
MFG CO.
'Z8622912PSC' PDF : 52 Pages View PDF
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2. Characters must be added dynamically to an on-screen
display.
3. On-screen rows must be dynamically moved, disabled,
or enabled.
The Z86229 supports manual screen mapping and display
control commands to handle these special applications.
These commands allow each of the 16 physical rows of
character memory implemented in the device to be mapped
to any of 15 display row positions.
Additionally, the 16 physical rows can be set for single or
double height and independently enabled and disabled.
Manual row mapping and control commands should only
be used in the POPSET OSD mode.
The procedure for manual row control is as follows:
1. Use the POPSET command to select the OSD pop-up
mode. This command prepares the Z86229 for OSD
input, clears the row maps, and erases character
memory.
2. Select a physical row (0 through 15) using the PHY
ROW SEL command.
3. Use the WRITE MAP command to set the display row
(1 through 15), Double-High bit, and enable bit of the
selected physical row.
The CURSOR SET, WRITE CHAR and WRITE CHARD
commands are used to position the cursor and write the char-
acters in the selected physical row.
A physical row may be re-selected at any time to change
its characters, row maps, Double-High mode, or enable sta-
tus. For example, it may be desirable to load several rows
of characters into physical memory without enabling them.
All of the rows could then be made to “pop” onto the screen
simultaneously by setting their enable bits.
The following example uses manual row mapping and con-
trol to write three rows of characters. The first row is a Dou-
ble-High row that is enabled before the characters are sent.
This condition allows the characters to “paint” onto the
screen as they are received. The second and third row are
not initially mapped or enabled when the characters are
written. They are then mapped and enabled after a two sec-
ond pause. A new row is then created off-screen to replace
the third row. Finally, after a 2 second pause, the second row
ZiLOG
is moved to a new display row, the original third row is dis-
abled, and the new third row is mapped and enabled.
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