AK7735EQ Datasheet, PDF (74/142 Pages) Asahi Kasei Microsystems – Dual DSP with 4chADC + 4chDAC + 4chSRC

[AK7735]
2. Echo-Back Mode
The AK7735 has Echo-back mode that outputs the writing data sequentially from the SO pin.
2-1. Write
CSN
SI
COMMAND ADDRESS1 ADDRESS2
DATA1
DATA2
don’tcare
(L/H)
COMMAND ADDRESS1
SO
COMMAND
ADDRESS1 ADDRESS2
DATA1
Hi-Z
COMMAND
Figure 53. Echo-back Mode Writing (SPI)
The input data of the SI pin is echoed back on the SO pin by shifting 8-bits to the right. The last 1 byte
written data is not echoed-back. The data will not echoed-back when writing dummy command.
2-2. Read
CSN
SI
COMMAND ADDRESS1 ADDRESS2
don’tcare
(L/H)
COMMAND ADDRESS1
SO
COMMAND DummyData READ DATA
READ DATA
Hi-Z
COMMAND
Figure 54. Echo-back Mode Reading (SPI)
Data of the address1/2 fields are not echoed back in read operation. The read data on the SO pin is
output after writing to the address2 field.
016014707-E-00
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2016/12