ST72361AR4-Auto datasheet(155/279 Pages) STMICROELECTRONICS

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ST72361xx-Auto

Serial peripheral interface (SPI)

Doc ID 12468 Rev 3

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14.8.3

Data I/O register (SPIDR)

Read/ write

Reset value: Undefined

The SPIDR register is used to transmit and receive data on the serial bus. In a master

device, a write to this register will initiate transmission/reception of another byte.

Note:

During the last clock cycle the SPIF bit is set, a copy of the received data byte in the shift

buffer is actually being read.

While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR

Warning:

A write to the SPIDR register places data directly into the

shift register for transmission.

A read to the SPIDR register returns the value located in the buffer and not the content of

the shift register (see Figure 70).

Table 59.

SPI register map and reset values

Address

(Hex.)

SPIDR

Reset value

MSB

LSB

SPICR

Reset value

SPIE

SPE

SPR2

MSTR

CPOL

CPHA

SPR1

SPR0

SPICSR

Reset value

SPIF

WCOL

OVR

MODF

SOD

SSM

SSI

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