AS3953A-BDFM datasheet(35/71 Pages) AMSOSRAM

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[v1-05] 2019-Feb-15

AS3953A − Detailed Description

Figure 40:

SPI Modes

MISO output is usually in tristate, it is only driven when output

data is available. Due to this the MOSI and the MISO can be

externally shorted to create a bidirectional signal.

During the time the MISO output is in tristate, it is possible to

switch on a 10 k

Ω pull-down by activating option bits miso_pd1

and miso_pd2 in IO Configuration Register.

Figure 41:

Signal to Controller

MODE

MODE Pattern (communication bits)

MODE Related Data

MODE

Trailer

Write

A4A3

A2A1

Data byte (or more bytes in

case of auto incrementing)

Read

A4A3

A2A1

Data byte (or more bytes in

case of auto incrementing)

EEPROM

Write

Word

Address

byte

4 bytes of

word data

EEPROM

Read

Word

Address

byte

4 bytes of

word data (or

multiple words

in case of auto

incrementing

FIFO Load

One or more bytes of FIFO

data

FIFO Read

One or more bytes of FIFO

data

COMMAND

Mode

MOSI

MISO

MOSI

AS3953A

MOSI

MISO

I/O

AS3953A

µC

Separate SPI Input and Output Signals to Controller

Bi-directional Data IO Signal to Controller

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