AS3953B datasheet(32/65 Pages) AMSOSRAM

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ams Datasheet

Page 31

[v1-04] 2016-Jan-07

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AS3953B − Application Information

Figure 39:

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 40:

Signal to Controller

MODE

MODE Pattern (communication bits)

MODE Related Data

MODE

Trailer

Write

Data byte (or more bytes in

case of auto incrementing)

Read

Data byte (or more bytes in

case of auto incrementing)

EEPROM

Write

010

000

Word

Address byte

4 bytes of

word data

EEPROM

Read

011

111

Word

Address byte

4 bytes of

word data (or

multiple

words in case

of auto

incrementing

FIFO Load

100

000

One or more bytes of FIFO

data

FIFO Read

101

111

One or more bytes of FIFO

data

COMMAND

Mode

MOSI

MISO

MOSI

AS3953B

MOSI

MISO

I/O

AS3953B

µC

Separate SPI Input and Output Signals to Controller

Bi-directional Data IO Signal to Controller

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