
201-0000-027 Rev 2.2, 9/30/99
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CHRONTEL
CH7008A
Registers and Programming
The CH7008 is a fully programmable device, providing for full functional control through a set of registers accessed
from the I
2
C port. The CH7008 contains a total of 37 registers, which are listed in
Table 11
and described in detail
under
Register Descriptions
. Detailed descriptions of operating modes and their effects are contained in the previous
section,
Functional Description.
An addition (+) sign in the Bits column below signifies that the parameter contains
more than 8 bits, and the remaining bits are located in another register.
Table 11. Register Map
Register
Symbol
DMR
FFR
VBW
IDF
CM
Address
00H
01H
03H
04H
06H
Bits
8
6
8
6
8
Functional Summary
Display Mode
Flicker Filter
Video Bandwidth
Input Data Format
Clock Mode
Display mode selection
Flicker filter mode selection
Luma and chroma filter bandwidth selection
Data format and bit-width selections
Sets the clock mode to be used
Start Active Video
SAV
07H
8+
Active video delay setting
Position Overflow
PO
08H
3
MSB bits of position values
Black level adjustment input latch clock edge select
Enables horizontal movement of displayed image on
TV
Black Level
BLR
HPR
09H
0AH
8
8+
Horizontal Position
Vertical Position
VPR
0BH
8+
Enables vertical movement of displayed image on
TV
Determines the horizontal and vertical sync polarity
Sync Polarity
Power Management
Connection Detect
Contrast Enhancement
PLL M and N extra bits
PLL-M Value
PLL-N Value
Buffered Clock
Subcarrier Frequency
Adjust
PLL and Memory Control
CIV Control
Calculated Fsc Increment
Value
Version ID
Test
SPR
0DH
4
PMR
CDR
CE
MNE
PLLM
PLLN
BCO
FSCI
0EH
10H
11H
13H
14H
15H
17H
18H -1FH
5
4
3
5
8+
8+
6
4 or 8
each
6
5
8 each
Enables power saving modes
Detection of TV presence
Contrast enhancement setting
Contains the MSB bits for the M and N PLL values
Sets the PLL M value - bits (7:0)
Sets the PLL N value - bits (7:0)
Determines the clock output at pin 41
Determines the subcarrier frequency
PLLC
CIVC
CIV
20H
21H
21H -
24H
25H
26H -
29H
3FH
Controls for the PLL and memory sections
Control of CIV value
subcarrier increment value
Device version number
Reserved for test (details not included herein)
VID
TR
8
30
Address
AR
6
Current register being addressed