MT9V012 Micron, MT9V012 Datasheet - Page 17

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

Two-Wire Serial Interface Sample Write and Read Sequences
16-Bit Write Sequence
Figure 12: Timing Diagram Showing a Write to Reg0x09, Value 0x0284
16-Bit Read Sequence
Figure 13: 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
S
ACK
A typical write sequence for writing 16 bits to a register is shown in Figure 12. A start bit
given by the master starts the sequence, followed by the write address. The image sensor
then sends an acknowledge bit and expects the register address to come first, followed
by the 16-bit data. After each 8-bit transfer, the image sensor sends an acknowledge bit.
All 16 bits must be written before the register is updated. After 16 bits are transferred, the
register address is automatically incremented so that the next 16 bits are written to the
next register. The master stops writing by sending a start or stop bit.
SCLK
DATA
A typical read sequence is shown in Figure 13. First the master writes the register
address, as in a write sequence. Then a start bit and the read address specify that a read
is about to happen from the register. The master clocks out the register data 8 bits at a
time. The master sends an acknowledge bit after each 8-bit transfer. The register address
should be incremented after every 16 bits is transferred. The data transfer is stopped
when the master sends a no-acknowledge bit.
Start
Reg0x09
0xBA Address
Two-Wire Serial Interface Sample Write and Read Sequences
ACK
ACK
MT9V012 - 1/6-Inch VGA CMOS Digital Image Sensor
Start
0xBB Address
Reg0x09
17
ACK
ACK
Micron Technology, Inc., reserves the right to change products or specifications without notice.
0000 0010
0000 0010
ACK
ACK
1000 0100
1000 0100
©2004 Micron Technology, Inc. All rights reserved.
ACK
Stop
NACK
Preliminary
Stop
‡