MT9M114_16 Datasheet, PDF (47/62 Pages) ON Semiconductor – High-Definition (HD) System-On- A-Chip (SOC) Digital Image Sensor

MT9M114: 1/6-Inch 720p High-Definition (HD) System-On-A-Chip (SOC) Dig-
ital Image Sensor
Note:
If a customer is using direct memory writes (XDMA), AND the first write ends on an
odd address boundary AND the second write starts on an even address boundary
AND the first write is not terminated by a STOP, the write data can become corrupted.
To avoid this, ensure that a serial write is terminated by a STOP.
Single Read from Random Location
This sequence (see Figure 29) starts with a dummy write to the 16-bit address that is to
be used for the read. The master terminates the write by generating a restart condition.
The master then sends the 8-bit read slave address/data direction byte and clocks out
one byte of register data. The master terminates the read by generating a no-acknowl-
edge bit followed by a stop condition. Figure 29 shows how the internal register address
maintained by the MT9M114 is loaded and incremented as the sequence proceeds.
Figure 29: Single Read from Random Location
Previous Reg Address, N
Reg Address, M
M+1
S Slave Address 0 A Reg Address[15:8] A Reg Address[7:0] A Sr Slave Address 1 A Read Data A P
S = start condition
P = stop condition
Sr = restart condition
A = acknowledge
A = no-acknowledge
slave to master
master to slave
Single Read from Current Location
This sequence (Figure 30) performs a read using the current value of the MT9M114
internal register address. The master terminates the read by generating a no-acknowl-
edge bit followed by a stop condition. The figure shows two independent read
sequences.
Figure 30: Single Read from Current Location
Previous Reg Address, N
S Slave Address
1
A
Read Data
[15:8]
A
Read Data
[7:0]
A
P
Reg Address, N+1
S Slave Address
1A
Read Data
[15:0]
N+2
AP
MT9M114/D Rev. 11, 2/16 EN
47
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