z86229 ZiLOG Semiconductor, z86229 Datasheet - Page 26

• Manufacturer Part Number: z86229
• Description: Z86229 Ntsc Line 21 Ccd Decoder
• Manufacturer: ZiLOG Semiconductor

COMMANDS
Serial Port Commands
The majority of the Z86229 commands are common to both
the I
be contained within the specified sequence (Start—Slave
Address—etc.).
Note:
Reset
RESET = FBh, FCh, 00h.
sequence in SPI or I
lishes all the specified default settings in the device, but it
does not reset the serial port itself. This sequence can be en-
tered without RDY being set.
No Operation
NOP = 00h.
I
the RDY bit in the Serial Status (SS) register and can be ex-
ecuted independent of the RDY status.
Serial Sync Bytes
SSB = FFh,....,FFh,FEh.
mode only. This command actually consists of a string of
single-byte commands in the form FFh,....FFh,FEh. SPI
mode communications can be synchronized by sending a
synchronizing data string to the part. This string should con-
sist of at least two SSB bytes of FFh, followed by one SSB
byte of FEh. At the end of the FEh byte, the port is ready
for use.
2
C mode. The NOP command does not affect the status of
2
C and SPI modes. In the I
In the following Command descriptions, the letter “h” fol-
lowing a command code designates hexadecimal nota-
tion.
Table 12. Basic Serial Commands
NOP is a one-byte command for use in SPI or
2
C mode. The RESET command estab-
Serial Sync Bytes are used in SPI
RESET is a three byte command
2
C mode, the commands must


Caption/Text Display Mode Commands
CPTX = 10h–1Fh.
commands are one-byte commands that select the Line 21
data stream (caption or text) for display.
A data channel can be selected for display with the display
either enabled (DEC ON) or disabled (DEC OFF). All these
commands turn off the active XDS display mode. Table 13
summarizes the device’s caption and text display modes and
the proper command code to activate them.
XDS Display Mode and 16-Second Erase Timer
Commands
XDS DISP = 20h–27h.
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 cap-
tion and XDS display modes. The 16-Second Erase Timer
has no affect on Text mode displays.
Bit
CM7
R/W
0
Table 13. Caption and Display Commands
Figure 12. CPTX–Caption/Text Display
CM6
R/W
0
CM5
These caption and text display-mode
R/W
(CPTX = 10h–1Fh)
0
XDS Display commands are one-
CM4
R/W
1
CM3
R/W
FLD
CPTX
CM2
R/W
CM1
LANG
R/W
ZiLOG
DONOF
R/W
CM0