CHRONTEL
CH5101A
201-0000-033 Rev 1.0, 6/2/99
15
Table 5. Register Descriptions
Register
Symbol
Address
(Hex)
00
Default
Value
0000
1011
0010
x000
xx11
1101
Description
Mode/Output Format
MOF
Selects the mode (CCIR601, CIF or QCIF) and
output format.
Sets the frame rate of the output signal. The
four MSBs contain the revision number.
Sets the horizontal start position of the active
output pixel in relationship to the HSYNC
signal.
Used to set the vertical start position of the
active output pixel in relationship to the VSYNC
signal.
Used in conjunction with ESLP register to
specify the duration of the electronic shutter.
Frame Rate
FR
01
Horizontal Start
HS
02
Vertical Start
VS
03
x0x1
0101
Electronic Shutter Length
High Byte
Electronic Shutter Length
Low Byte
RESERVED
ESLH
04
1111
0000
ESLL
05
0000
0000
Used in conjunction with ESLL register to
specify the duration of the electronic shutter.
06 - 16
Reserved Do not use
PSH Gain
Gamma
PSHG
17
0001
1001
Selects the gain of the programmable sample
and hold.
000 = 0dB gain, 111 = 14dB gain.
Selects the level that the black level clamp
adjust to during dark pixel.
7,6,5: Reserved
4: Power Down
3: V Sync. Polarity
2: H Sync. Polarity
1,0: Border Color
The four MSBs hold the device ID. The four
LSBs hold the version ID.
Test Register
Clamp Level
BCLMP
18
1000
0000
1000
0000
Miscellaneous
MISC
19
Device ID
DID
1A
0010
0000
0000
0000
0000
0000
1110
0100
Test Register
TST
1B
Test Memory
TM
1C
Test Register
Auto-Shutter Enable
ASE
1D
Enables and controls the following autoshutter
algorithm parameters:
7: Enables the AS to control the shutter
6: Enables the AS to control black level
5: Enables the AS to control programmable
gain.
4,3: Reserved
2-0: Determines the threshold of the shutter
gain setting to enable black level changes.