AR0135CS Datasheet, PDF (11/27 Pages) ON Semiconductor – 1/3‐inch 1.2 Mp CMOS Digital Image Sensor

AR0135CS
Single READ from Random Location
This sequence (Figure 8) 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-acknowledge bit followed by a stop
condition. Figure 8 shows how the internal register address
maintained by the AR0135CS is loaded and incremented as
the sequence proceeds.
Previous Reg Address, N
Reg Address, M
S
Slave
Address
0A
Reg
Address[15:8]
A
Reg
Address[7:0]
A Sr
Slave Address
1A
S = Start Condition
P = Stop Condition
Sr = Restart Condition
A = Acknowledge
A = No-acknowledge
Slave to Master
Master to Slave
Read Data
Figure 8. Single READ from Random Location
M+1
AP
Single READ from Current Location
This sequence (Figure 9) performs a read using the
current value of the AR0135CS internal register address.
The master terminates the READ by generating
a no-acknowledge bit followed by a stop condition. The
figure shows two independent READ sequences.
Previous Reg Address, N
S Slave Address 1 A
Read Data
AP
Reg Address, N+1
S Slave Address 1 A
Read Data
N+2
AP
Figure 9. Single READ from Current Location
Sequential READ, Start from Random Location
This sequence (Figure 10) starts in the same way as the
single READ from random location (Figure 8). Instead of
generating a no-acknowledge bit after the first byte of data
has been transferred, the master generates an acknowledge
bit and continues to perform byte READs until “L” bytes
have been read.
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
M+1
M+2
M+3
M+L−2
M+L−1
M+L
Read Data
A Read Data
A
Read Data
A
Read Data
AP
Figure 10. Sequential READ, Start from Random Location
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