bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 114

• Manufacturer Part Number: bt829bkrf
• Description: Video Streamii Decoders
• Manufacturer: ETC-unknow

104
4.0 Control Register Definitions
0x1D—Extended Data Service/Closed Caption Data Register
0x1D—Extended Data Service/Closed Caption Data Register (CC_DATA)
The CC-DATA register is read only and can be read by the MPU at any time. Any writes to this register are
ignored. Upon reset, the value of the bits in this register are indeterminate because their status depends on the
incoming CC/EDS data. CC_DATA(0) is the LSB.
CC_DATA
0x1E—White Crush Down Count Register (WC_DN)
This control register may be written to or read by the MPU at any time. Upon reset, the value of the register bits
is initialized to 0x7F. DNCNT(0) is the LSB. This register is programmed with a two’s complement number.
VERTEN
WCFRAME
DNCNT
0x1F—Software Reset Register (SRESET)
This command register can be written at any time. Read cycles to this register return an undefined value. A data
write cycle to this register resets the device to the default state (indicated in the command register definitions by
an asterisk). Writing any data value into this address resets the device.
VERTEN
7
X
7
0
WCFRAME
The low or high data byte transmitted in a closed caption or extended data service line.
This bit programs the rate at which the DNCNT and UPCNT values are accumulated.
The value programmed in these bits accumulates at a rate of once-per-field or frame. The accu-
mulated value determines the extent to which the AGC value needs to be lowered to keep the
SYNC level proportionate to the white level.
6
X
6
1
The DNCNT value is assumed negative:
X
5
5
1
0*
1
0
1
3F
3E
:
.
00
=
=
=
=
=
=
:
.
=
Normal operation
Adds vertical detection algorithm to reject noise causing false
vertical syncs.
Once-per-field
Once-per-frame
:
.
–1
–2
–64
4
X
4
1
D829BDSA
CC_DATA
3
X
3
1
DNCNT
X
2
2
1
VideoStream II Decoders
1
X
1
1
Bt829B
0
X
0
1