MT9V012 Micron, MT9V012 Datasheet - Page 18

• Manufacturer Part Number: MT9V012
• Description: 1/6-Inch VGA CMOS Digital Image Sensor
• Manufacturer: Micron

8-Bit Write Sequence
Figure 14: Timing Diagram Showing a Write to Reg0x09, Value 0x0284
8-Bit Read Sequence
Figure 15: Timing Diagram Showing a Read from Reg0x09; Returned Value 0x0284
PDF: 814eb99f/Source: 8175e929
MT9V012_2.fm - Rev. B 2/05 EN
S
SCLK
DATA
Start
0xBA Address
ACK
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 writing the upper 8 bits to the desired register, 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 update just half of a register. Figure 14
shows a typical sequence for 8-bit writes. The second byte is written to the special regis-
ter (Reg0xF1).
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 15). The master sets the
no-acknowledge bits.
S
S
• •
SCLK
SCLK
DATA
DATA
Reg0x09
Start
Start
0xBA Address
0xBA Address
Two-Wire Serial Interface Sample Write and Read Sequences
ACK
0000 0010
MT9V012 - 1/6-Inch VGA CMOS Digital Image Sensor
ACK
ACK
Reg0x09
Reg0xF1
ACK
18
Start
0xBA Address
ACK
ACK
Micron Technology, Inc., reserves the right to change products or specifications without notice.
Start
Start
0xBB Address
0xBB Address
ACK
Reg0xF1
ACK
ACK
ACK
0000 0010
1000 0100
©2004 Micron Technology, Inc. All rights reserved.
1000 0100
NACK
NACK
Preliminary
ACK
Stop
• •
Stop
‡