Z86129 Datasheet, PDF (45/50 Pages) Zilog, Inc. – NTSC LINE 21 DECIDER

PRELIMINARY
Z86129/130/131
NTSC Line 21 Decoder
General Commands
Caption and XDS display modes. The 16 Second Erase
Timer has no affect on TEXT mode displays.
Serial Cmd
RESET
NOP
SSB
Cmd Code
FBh, FCh, 00h
00h
FFh,...FFh,FEh
XDS Display
XDS Display Command Code
1
Command
16 Sec Tmr ON 16 Sec Tmr OFF
XDSG
23h
27h
XDSF
21h
25h
Caption/text Display Mode Commands
16 SECOND
CPTX = 10h-1Fh. Caption and Text display mode
commands. These commands select the desired Line 21
data stream (Closed Caption or Text) for display. See the
ERASE TIMER
20h
24h
Note: Changing the ON/OFF state of the 16 Second Erase Tim-
er has no affect on the current display mode in operation.
Commands section for a complete description of the
CPTX Display Mode command.
SCRIPTI Program
This program is designed to send any number of one or
Bit CM7 CM6 CM5 CM4 CM3 CM2 CM1 CM0
0
0
0
1 FLD LANG CPTX DONOF
two byte commands to the Z86129. The list of commands
to be executed are contained in Script files that have the
extension.SER. Examples of such files will be presented in
R/W R/W R/W R/W R/W R/W R/W R/W
the following paragraphs. SCRIPTI can be used to control
the display modes in the same manner as the IICO
Figure 29. CPTX - Caption/Text Display
(CPTX = 10h-1Fh)
program except that the one byte command to be sent
must be in a Script file. For example a file called CC1.SER
would contain the one byte command:
Caption and Text display commands are one byte
commands. A data channel can be selected for display
with the display either enabled (DEC ON) or disabled
(DEC OFF). All these commands will turn off an active
XDS display mode. The following table summarizes the
device’s Caption and Text display modes and the proper
command code to activate them
{17}* send CC1, decoder ON
The program is invoked by typing:
SI File_name<ENTER>
Note: File_name without the .SER extension
CPTX
Command
CC1
CC2
CC3
CC4
T1
T2
T3
T4
CPTX Command Code
Decoder ON
Decoder OFF
17h
16h
15h
14h
1Fh
1Eh
1Dh
1Ch
13h
12h
11h
10h
1Bh
1A
19h
18
XDS Display Mode and 16 Second Erase Tim-
er Commands
XDS DISP = 20h-27h. XDS Display commands are one
byte commands. These commands control the selection of
XDS display modes and the state of the 16 Second Erase
Timer. The 16 Second Erase Timer is active only for
The screen will display:
EEG CCD2 Serial Interface Script Player Version x.xx
Slave Address is 28h
Script File Done
The responding slave address is reported to the screen.
When all the commands in the file have been successfully
sent to the Z86129, the PC will return to the system
prompt.
The program checks the RDY status before sending each
byte. If, during the entry of a command, the RDY bit is not
found to be a "one" after an extended wait, the program will
report the contents of the SS register and then continue
checking for RDY.
DS96TEL0200
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