z86131 ZiLOG Semiconductor, z86131 Datasheet - Page 31

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

ZiLOG
The WRITE commands require two bytes to execute. The
first byte is the write command and includes the Z86129
register address (AD00:04) being written. The second byte
is the data to be written.
OSD Display Mode Commands (Z86129 Only)
OSD commands are one and two byte commands. They are
used to control the loading of data for OSD display and their
Figure 20 illustrates the two different character sets, Graph-
ics or Extended, that share the address space C0h–FFh. The
Graphics Character set is in force when the OSD display is
in Drop Shadow mode (the default condition).
DS007200-TVX0199
Command Name
RETURN
CLRE
TEXTSET
POPSET
FLIP
OEDM
OENM
Command Name
POP ROW SEL (with
Double-High Option)
PHYS ROW SEL
CURSOR SET
WRITE CHAR
WRITE MAP
WRITE CHAR DBL WIDE A5h
WAIT
Table 20. Single-Byte OSD Display Mode Commands (Z86129 Only)
Table 21. Two-Byte OSD Display Mode Commands (Z86129 Only)
Code
30h
31h
32h
33h
36h
37h
38h
First
Byte
A0h
A1h
A2h
A3h
A4h
A6h
Second
Byte
rrh
rrh
cch
ddh
rrh
ddh
nnh
Command Function
Carriage return for OSD when in TEXTSET mode
OSD equivalent of delete to end of row (DER)
Establishes a TEXT type of OSD display
Establishes a pop-on type of OSD display
OSD equivalent of pop-on caption end of caption (EOC)
OSD equivalent of erase displayed memory
OSD equivalent of erase non-displayed memory
P R E L I M I N A R Y
Command Function
Sets display row and moves cursor to char column 1. The low order
nibble of rr designates the display row. Bit 5 of rr speciÞes a Double-
High row. For example: rr = 0Eh would select display row 14. rr = 23h
would select display row three, Double-High.
Sets the physical row, where the low order nibble of rr designates the
physical row. rr can be any value from 00h to 0Fh.
Places the cursor at the character column position designated by cc,
which can be any value from 00h to 20h (column 0Ð32). Zero is the
PAC space.
Writes the data byte dd to the current cursor location and then incre-
ments the cursor.
Maps the current physical row to the display row designated by the
low nibble of the rr byte. Bit 4 of rr = 1 enables display of the row. Bit 5
of rr = 1 indicates a Double-High row.
Same as A3 command but speciÞes a Double-Wide character.
Sets the RDY bit of SS and then suspends serial command execution
for approximately the number of frames designated by the nn byte.
presentation to the screen. Normally OSD display mode
uses 15 TV lines per display row to enhance the screen ap-
pearance. The following tables summarize the single- and
two-byte control commands for the Z86129/130/131 On-
Screen Display.
The two-byte commands GRAPHICS and EXTENDED
can be used to switch from the Graphics Characters to the
Extended Characters and vice versa. An OSD screen can
only use one set at a time.
NTSC Line 21 Decoder
Z86129/130/131
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