ST7DALIF2 datasheet(112/171 Pages) STMICROELECTRONICS

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Serial peripheral interface (SPI)

ST7DALIF2

112/171

1: Slave deselected

17.7.3

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

Caution:

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 45).

Table 49.

SPI register map and reset values

Address

(Hex.)

label

543

210

0031h

SPIDR

Reset

Value

MSB

LSB

0032h

SPICR

Reset

Value

SPIE

SPE

SPR2

MSTR

CPOL

CPHA

SPR1

SPR0

0033h

SPICSR

Reset

Value

SPIF

WCOL

OVR

MODF

SOD

SSM

SSI

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