NOIL1SN3000A
Serial Peripheral Interface (SPI )
The SPI registers have an address space of 7 bits,
a<6>–a<0>, and 8 data bits, d<7>–d<0>. A single
instruction bit chooses between a read or write instruction.
The SPI is used only after the clock has started and the chip
is not in reset. Otherwise, the SPI register is kept in reset. SPI
registers are reset to their default value by bringing
RESET_N low. The SPI bit RESET_N_SEQ has no effect
on the SPI bits.
Setup and hold requirements of interface signals relative
to SPI_CLK are for both requirements 2.5 ns. Output delay
is 1.5 ns after falling edge of SPI_CLK. Rise time (10% to
90%) is 9 ns assuming a 18 pF load. To upload SPI, follow
Read Sequence, C=0
The part is selected by pulling CS low. The 1-bit
instruction (READ) is transmitted to the image sensor,
followed by the 7-bit address (A6 through A0). The
instruction and address bits are clocked in on the rising edge
of the clock. After the correct READ instruction and address
are sent, the data stored in the memory at the selected address
is shifted out on the MISO pin. The data bits are shifted out
on the first falling edge after the last address bit is clocked.
The read operation is terminated by raising the CS pin. The
maximum operating frequency is 10 MHz.
NOTE: SPI settings cannot be uploaded during readout.
this sequence:
Disable sequencer ? Upload through SPI ? Enable
sequencer
Figure 16. SPI Read Timing
Write Sequence, C=1
The image sensor is selected by pulling CS low. The
WRITE instruction is issued, followed by the 7-bit address,
and then the 8-bit data. All data is clocked in on the rising
edge of the clock.
To write the data to the array, the CS is brought high after
the least significant bit (D0) of the data byte is clocked in. If
CS is brought high at any other time, the write operation is
not completed. Maximum operating frequency is 10 MHz.
Figure 17. SPI Write Timing
http://onsemi.com
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