PAS202BCB Datasheet, PDF (9/15 Pages) Pixart Imaging Inc. – PAS202BCB SINGLE-CHIP CMOS VGA COLOR DIGITAL IMAGE SENSOR PAS202BBB SINGLE-CHIP CMOS VGA B&W DIGITAL IMAGE SENSOR

PixArt Imaging Inc.
PAS202BCB/PAS202BBB
CMOS Image Sensor IC
registers value inside PAS202BCB/PAS202BBB can be programming via this way. (Please refer to Fig 4.3.)
4.2.2 Slave transmits data to master (read cycle)
§ The sub-address was taken from previous write cycle
§ The sub-address is automatically increment after each byte read
§ Am : Acknowledge by master
§ Note there is no acknowledgment from master after last byte read
1ST BYTE
S
SLAVE ADDRESS
(7 BITS)
RW A
2ND BYTE
DATA (8 BIT)
n BYTE
Am DATA Am DATA 1 P
NO ACK IN LAST
BYTE
During read cycle, the master generates start condition and then place the 1^st byte data that are combined
slave address (7 bits) with a read/write control bit to SDA line. After issue acknowledgment, 8 bits DATA was
also placed on SDA line by PAS202BCB/PAS202BBB. The 8 bit data was read from PAS202BCB/PAS202BBB
internal control register that address was assigned by previous write cycle. Follow the master acknowledgment,
the PAS202BCB/PAS202BBB place the next 8 bits data (address is increment automatically) on SDA line and
then transmit to master serially. The DATA and Am cycles is repeat until the last byte read. After last byte read,
Am is no longer generated by master but instead by keep SDA line high. The slave (PAS202BCB/PAS202BBB)
must releases SDA line to master to generate STOP condition. (Please refer to Fig 4.3.)
Fig 4.3 Data Transfer Format
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PixArt Imaging Inc.
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V2.0, May 2002