Z86130 ZILOG [Zilog, Inc.], Z86130 Datasheet - Page 28

• Manufacturer Part Number: Z86130
• Description: NTSC LINE 21 DECIDER
• Manufacturer: ZILOG [Zilog, Inc.]

Z86129/130/131
NTSC Line 21 Decoder
INTERNAL REGISTERS
Information controlling the setup and operation of the
Z86129/130/131 are maintained in several registers. The
user may read or alter the contents of these registers as
required.
Serial Status (SS) Register Address = Not Rqd.
D
circuits are locked. May be used as an indication of the
presence of a video signal.
D
High = Field 1.
D
the output buffer has not been read out and new data has
been written over it.
D
than DAV is pending.
D
overrun.
D
Low = 1 byte, High = 2 bytes.
D
read out.
D
empty. Only the NOP, RESET and READ instructions may
be sent if RDY is Low.
Configuration Register Address = 00h.
D
and Low selects NTSC. The default is NTSC. When PAL
is selected the display defaults to 15 TV scan lines per
display row.
28
Bit
Bit
0
1
2
3
4
5
6
7
0
Figure 19. Configuration Register (Address = 00h)
-LOCK. Active High, indicating that the internal sync
-FLD. Signals the current video field. Low = Field 2,
-ROVR. Active High, indicating that the data available in
-INTR. Active High, indicating that an interrupt other
-WOVR. Active High, indicating a serial input data
-RD2. Signals the number of bytes available for output.
-DAV. Active High, indicating that data is available to be
-RDY. Active High, indicating that the port input buffer is
-TVS. Selects the television standard. High selects PAL
RDY
R
D
res
D
7
7
Figure 18. Serial Status Register
DAV
D
R
D
res
6
6
(Address not required)
RD2
D
R
res
D
5
5
WOVR
D
D
res
R
4
4
INTR
R/W
VLK
D
R
D
3
3
ROVR FLD LOCK
R/W
D
HLK
R
D
2
2
MONO
D
R/W
R
D
1
1
P R E L I M I N A R Y
R/W
TVS
D
R
D
0
0
D
indicating that character luminance will be output on all
three color pins (RGB). The default is Low, selecting
COLOR operation.
D
lock the VCO: Low = Internal, High = HIN. The default is
Internal.
D
establish vertical sync lock: Low = Internal, High = VIN.
The default is Internal. When Internal lock is enabled the
VIN/INTRO pin will default to the INTRO output mode.
Interrupts should not be selected in the Interrupt Mask
register if VLK mode is used.
D
Display Register Address = 01h
D
mode: High = DROP SHADOW and Low = BOX. The
default is Low.
D
in a TEXT display: High = 15 lines/row and Low = 13
lines/row. The default is Low.
D
display: High = Disabled, Low = Enabled. The default is
Low.
D
mode: High = DROP SHADOW and Low = BOX. The
default is Low.
D
in a CAPTION display: High = 15 lines/row and Low = 13
lines/row. The default is Low.
D
display: High = Disabled, Low = Enabled. The default is
Low.
Note: OSD and XDS display modes always have
Enhanced Attributes enabled.
Bit
1
2
3
4
0
1
2
3
4
5
-MONO. Selects monochrome operation. Active High,
-HLK. Selects the horizontal signal source to be used to
-VLK. Selects the vertical signal source to be used to
-D
-TDRP. Selects Drop Shadow or Full Box in TEXT
-T15. Selects the number of TV lines per character row
-TENH. Enables Enhanced Attributes for a TEXT
-CDRP. Selects Drop Shadow or Full Box in CAPTION
-C15. Selects the number of TV lines per character row
-CENH. Enables Enhanced Attributes for a CAPTION
7
R/W
Figure 20. Display Register (Address = 01h)
O15 ODRP CENH
. Reserved
D
7
R/W
D
6
R/W
D
5
C15
R/W
D
4
CDRP TENH
R/W
D
3
R/W
D
2
DS96TEL0200
R/W
T15
D
1
TDRP
R/W
D
0