MT9M011 View Datasheet(PDF) - Micron Technology
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MT9M011 Datasheet PDF : 41 Pages
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Preliminary‡
MT9M011 - 1/3-Inch Megapixel Image Sensor
Two-wire Serial Interface Sample Write and Read Sequences
Eight-Bit Write Sequence
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 (Reg0xF1). 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 10 a typical sequence for 8-bit writing is shown. The second byte is written
to the special register (Reg0xF1).
Figure 10: Timing Diagram Showing a Write to Reg0x09 with the Value 0x0284
SCLK
SDATA
0xBA ADDR
Reg0x09
START
ACK
ACK
0000 0010
ACK
0xBA ADDR
START
ACK
Reg0xF1
1000 0100
STOP
ACK
ACK
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 (Reg0xF1) the lower 8 bits are accessed (Figure 11). The master sets the
no-acknowledge bits.
Figure 11: Timing Diagram Showing a Read from Reg0x09; Returned Value 0x0284
SCLK
SDATA
0xBA ADDR
START
ACK
SCLK
SDATA
0xBA ADDR
START
ACK
Reg0x09
0xBB ADDR
ACK
START
ACK
0000 0010
NACK
Reg0xF1
0xBB ADDR
ACK
START
ACK
1000 0100
STOP
NACK
PDF: 09005aef81051c04/Source: 09005aef8102abe8
MT9M011_2.fm - Rev. D 1/05 EN
15
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved.
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