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MT9V111 Datasheet(PDF) 39 Page - Micron Technology

Part No. MT9V111
Description  1/4-Inch SOC VGA CMOS Active-Pixel Digital Image Sensor
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Maker  MICRON [Micron Technology]
Homepage  http://www.micron.com
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MT9V111 Datasheet(HTML) 39 Page - Micron Technology

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Micron Technology, Inc., reserves the right to change products or specifications without notice.
MT9V111_2.fm - Rev. G 1/05 EN
39
©2004 Micron Technology, Inc. All rights reserved.
MT9V111 - 1/4-Inch SOC VGA Digital Image Sensor
Two-wire Serial Interface Sample Write and Read Sequences
Eight-Bit Write Sequence
All registers in the camera are treated and accessed as 16-bit, even when some registers
do not have all 16-bits used. However, certain hosts only support 8-bit serial communi-
cation access. The camera provides a special accommodation for these hosts.
To be able to write one byte at a time to the register a special register address is added.
The 8-bit write is done by first writing the upper 8 bits to the desired register and then
writing the lower 8 bits to the special register address (Reg0x7F). The register is not
updated until all 16 bits have been written. It is not possible to just update half of a regis-
ter. In Figure 18, a typical sequence for 8-bit writing is shown. The second byte is written
to the special register (Reg0x7F).
Figure 18: Timing Diagram Showing a Bytewise Write to Reg0x09 with Value
0x0284
Eight-Bit Read Sequence
To read one byte at a time the same special register address is used for the lower byte.
The upper 8 bits are read from the desired register. By following this with a read from the
special register (Reg0x7F) the lower 8 bits are accessed, as shown in Figure 19 The mas-
ter sets the no-acknowledge bits.
Figure 19: Timing Diagram Showing a Bytewise Read from Reg0x09; Returned
Value 0x0284
STOP
Reg0x7F
ACK
START
0xB8 ADDR
ACK
SDATA
SCLK
ACK
ACK
ACK
ACK
Reg0x09
0xB8 ADDR
0000 0010
1000 0100
START
START
0xB9 ADDR
SDATA
SCLK
STOP
NACK
ACK
ACK
ACK
Reg0x09
START
0xB8 ADDR
0000 0010
START
0xB9 ADDR
SDATA
SCLK
NACK
ACK
ACK
ACK
Reg0x7F
START
0xB8 ADDR
1000 0100


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