31
TABLE 30. HOST CONTROL REGISTER
SUB ADDRESS = 1F
H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7
Software Reset
When this bit is set to 1, the entire device except the I
2
C bus is reset to a known state
exactly like the RESET input going active. The software reset will initialize all register bits
to their reset state. Once set this bit is self clearing after only 4 CLK periods. This bit is
cleared on power-up by the external RESET pin.
0
B
6
Reserved
0
B
5
Closed Caption
Odd Field
Read Status
This bit is read-only. Data written to this bit is ignored. The bit is cleared when the caption
data has been read out via the I
2
C interface or as BT.656 ancillary data.
0 = No new caption data
1 = Caption_ODD_A and Caption_ODD_B data registers contain new data.
0
B
4
Closed Caption
Even Field
Read Status
This bit is read-only. Data written to this bit is ignored. The bit is cleared when the caption
data has been read out via the I
2
C interface or as BT.656 ancillary data.
0 = No new caption data
1 = Caption_EVEN_A and Caption_EVEN_B data registers contain new data.
0
B
3
WSS
Odd Field
Read Status
This bit is read-only. Data written to this bit is ignored. The bit is cleared when the WSS
data has been read out via the I
2
C interface or as BT.656 ancillary data.
0 = No new WSS data
1 = WSS_ODD_A and WSS_ODD_B data registers contain new data.
0
B
2
WSS
Even Field
Read Status
This bit is read-only. Data written to this bit is ignored. The bit is cleared when the WSS
data has been read out via the I
2
C interface or as BT.656 ancillary data.
0 = No new WSS data
1 = WSS_EVEN_A and WSS_EVEN_B data registers contain new data.
0
B
1-0
Reserved
00
B
TABLE 31. CLOSED CAPTION_ODD_A DATA REGISTER
SUB ADDRESS = 20
H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7-0
Odd Field
Caption Data
If odd field captioning is enabled and present, this register is loaded with the first eight
bits of caption data on line 18, 21, or 22. Bit 0 corresponds to the first bit of caption infor-
mation. Data written to this register is ignored.
80
H
TABLE 32. CLOSED CAPTION_ODD_B DATA REGISTER
SUB ADDRESS = 21
H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
15-8
Odd Field
Caption Data
If odd field captioning is enabled and present, this register is loaded with the second eight
bits of caption data on line 18, 21, or 22. Data written to this register is ignored.
80
H
TABLE 33. CLOSED CAPTION_EVEN_A DATA REGISTER
SUB ADDRESS = 22
H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7-0
Even Field
Caption Data
If even field captioning is enabled and present, this register is loaded with the first eight
bits of caption data on line 281, 284, or 335. Bit 0 corresponds to the first bit of caption
information. Data written to this register is ignored.
80
H
HMP8115