MT9V112 Datasheet, PDF (55/58 Pages) Micron Technology – SOC VGA DIGITAL IMAGE SENSOR

PRELIMINARY
MT9V112
SOC VGA DIGITAL IMAGE SENSOR
8-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
started by writing the upper 8 bits to the desired regis-
ter, then writing the lower 8 bits to the special register
address (R0xF1:0). The register is not updated until all
16 bits have been written. It is not possible to update
just half of a register. In Figure 17, a typical sequence
for an 8-bit WRITE is shown. The second byte is writ-
ten to the special register (R0xF1:0).
Figure 17: WRITE Timing to R0x09:0—Value 0x0284
SCLK
SDATA
0xBA Address
Start
ACK
Reg0x09
ACK
0000 0010
0xBA Address
Start
ACK
ACK
Reg0xF1
ACK
1000 0100
Stop
ACK
8-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 (R0xF1:0), the lower 8
bits are accessed (Figure 18). The master sets the no-
acknowledge bits.
Figure 18: READ Timing from R0x09:0; Returned Value 0x0284
SCLK
SDATA
0xBA Address
Start
ACK
Reg0x09
0xBB Address
Start
ACK
ACK
0000 0010
••
NACK
SCLK
SDATA
••
0xBA Address
Start
ACK
Reg0xF1
0xBB Address
Start
ACK
ACK
1000 0100
Stop
NACK
09005aef8154a39d/09005aef8175e6cc
MT9V112_2.fm- Rev. A 1/05 EN
55
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