Specifications

86 Issue Date: 2004/11/05 │ CONFIDENTIAL
CL765 │ Camera Application Processor
Datasheet │ Doc. #: CLQP-DS-743
When providing power to GPIO from the point A, 0x24 should be set at the
point B to activate Sensor Interface Part. Reversely, to stop Preview of the
sensor, Register 0x24 should be set to 0 and turn off the power provided to the
GPIO. In this case, the leaking current may flow to the sensor during the
period of red part in Figure 1-4. Therefore, 0x24 should be set since providing
the power to GPIO as quick as possible.
e) Vsync Delay Register(0x26)
f) IIC Clock Direction Register (0x27)
- Bit[0]: In most sensors, the SCK Line of IIC Bus is Single Direction. In short,
the CL765 is Output PAD and the SCK of its sensor is operated as
Input. But in some sensors (SONY CMOS/PHILIPS CMOS), SCK
LINE is operated as Input/Output. To operate these sensors, this
Bit[0] should be set. In CL765, if this Bit[0] is set, following sequence
is proceeded at the point that the sensor abandons the seizure of
SCK Line after ACK period (the period that the sensor seizes SDA).
IIC Operation Hold Time
Figure 4-34. IIC Operation Hold Time
- Bit[7]: When NACK is received from the sensor while IIC Data is being
written, the CL765 stops to write data of that cycle and accesses to
the next cycle. In other words, when NACK is received, instead of
ACK, while Device/Address/Data is being written, the CL765 stops
to process the cycle. But in case of some sensors, because of the
timing difference between the time that the CL765 receives ACK
and the time that the sensor seizes SDA, the CL765 cannot
recognize the ACK even when the ACK has been returned. In this
case, the CL765 performs IIC Routine regardless of ACK by setting
this Bit.
g) Sensor Access Control (0x28)
- Bit[1:0] : The number of data bytes to write in the sensor. When 1 is written
for this value, data of 1Byte is written through IIC (Figure 1-2).
But if this value is 2, as shown in Figure 1-2, the process of G’(the
2nd Byte) H’(the 2nd ACK) is written one more after H Cycle.