AS3956 datasheet(63/109 Pages) AMSCO

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ams Datasheet

Page 63

[v1-10] 2018-Apr-27

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AS3956 − Detailed Description

Figure 60:

SPI Communication: Reading a Single Register

Writing and Reading of EEPROM Through SPI

EEPROM data can be read and written also through SPI

interface. Arbitration between EEPROM access via the RF and

SPI/I²C interface is performed on a first-come-first-serve basis

as described in Interface Arbitration.

Word Address Byte

Both EEPROM modes (Read and Write) use Word Address byte

to define the address of the EEPROM word which is accessed.

Seven MSB bits of the Address Byte are used to define the

address; while the last bit is don’t care (it is used to synchronize

EEPROM access).

Figure 61:

EEPROM Block Address Byte

EEPROM Write

In order to program an EEPROM block, six bytes shall be sent

(mode byte, block address byte and 4 bytes of data, all of them

MSB first). Actual EEPROM programming is started with rising

/SS edge signal which terminates the EEPROM Write command.

EEPROM Block Address

WA6

WA5

WA4

WA3

WA2

WA1

WA0

SCLK rising

edge Data is

moved from

Address

<A4-A0>

/SS rising

edge signals

end of READ

Mode

Three

leading bits

indicate The

Mode

SCLK rising

edge Data is

transferred

from µC

SCLK falling

edge Data is

sampled

SCLK falling

edge Data is

transferred to

µC

/SS

SCLK

MOSI

MISO

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