AS8506 datasheet(41/89 Pages) AMSCO

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ams Datasheet, Confidential:2013-Sep [1-00]

AS8506 – 41

Devic e I n te r f ac e

Figure 34:

SPI Block Write Operation with Negative Clock Polarity

SPI Read Operation

The SPI read operation also begins with clock polarity selection

at negative edge of SCSN (see Figure 30). Once the clock

polarity is selected, the SPI read command is given by providing

‘1’ in R/W bit of the header field in first sampling edge at SDI

pin. The next bit in header fields is reserved and set to ‘0’. The

6 bits address of register to be read is provided at SDI pin in

next six consecutive sampling edges of SCLK. The read data is

followed by last bit of header field on SDO pin. With each

sampling edge a bit can be read on SDO pin starting from MSB

to LSB. In case of multi-data bytes, MSB of next data byte can

be read after the LSB of previous data byte. During complete

SPI read operation the SCSN has to be ‘Low’. The SPI read

operation ends with positive edge of SCSN. The wave form for

SPI read operation with single data byte is shown in Figure 35

and Figure 36.

Figure 35:

SPI Read Operation with Negative Clock Polarity and 1 Byte of Data Field

SCLK

SDI

SDO

Data D7-D0 is

moved to Address

A5-A0 here

Data D7-D0 is

moved to Address

A5-A0 +1 here

Data D7-D0 is

moved to Address

A5-A0 +2 here

Data D7-D0 is

moved to Address

A5-A0 +3 here

Data D7-D0 is

moved to Address

A5-A0 +4 here

SCLK

SDI

SDO

SCSN

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