CS7620 查看數據表（PDF） - Cirrus Logic
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CS7620 Datasheet PDF : 70 Pages
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CS7620
4.3 Power Down Control 2
Default = 00; Read/Write (address 02h)
Bit Number
Bit Name
Default
7
6
5
4
3
2
1
0
Reserved
pd_htim Reserved
-
-
-
-
-
-
0
-
Bit
Mnemonic
Function
7:2
-
Reserved
Horizontal Timing Power Down: When written with a ‘1’, the horizontal tim-
1
pd_htim
ing generator powers down. Should be powered down when horizontal timing
is not being used by the system. In this mode the chip is a “timing slave.”
0
-
Reserved
4.4 Operation Control 1
Default = 09h; Read/Write (address 06h).
Bit Number
Bit Name
Default
7
low_res
0
6
5
tim_modes2 tim_modes1
0
0
4
tim_modes0
0
3
bits_out1
1
2
bits_out1
0
1
blk_dis
0
0
off_range
1
Bit
Mnemonic
Function
Low Resolution Mode: This mode can be used to cut the current consump-
tion of the chip by 20 mA. The output of the ADC will have 6 bits of resolution
7
low_res
in this mode, and the output of the chip will have 9 bits after using the DRX
circuitry. It is intended to be used when driving an LCD display or any other
time when a lower resolution picture is acceptable.
Timing Generator Select: The type of timing signals output by the chip can
6
tim_modes2
be selected using these control bits. IBM35CCDPIX13 2x2 and
IBM35CCDPIX13 3x4 modes, support type IBM CCDs with different color filter
patterns. Note that register 1Bh needs to be rewritten with correct low resolu-
tion values for black rows if low resolution mode is used (see Table 3).
5
tim_modes1
The chip’s default power up setting is hardcoded to be IBM35CCD2PIX1. So
that the registers that hold the number of lines, the number of pixels per line,
the number of black lines, and the number of active lines are all set up to their
4
tim_modes0
proper values. If IBM35CCDPIX13 is to be used, the values on all those reg-
isters has to be changed appropriately (see Tables 5 and 6).
DS301PP2
29
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