
Serial peripheral interface (SPI) ST72321xx-Auto
134/243 Doc ID 13829 Rev 1
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 55).
Table 69. SPI register map and reset values
Address
(Hex.)
Register
label
76543210
0021h
SPIDR
Reset value
MSB
xxxxxxx
LSB
x
0022h
SPICR
Reset value
SPIE
0
SPE
0
SPR2
0
MSTR
0
CPOL
x
CPHA
x
SPR1
x
SPR0
x
0023h
SPICSR
Reset value
SPIF
0
WCOL
0
OVR
0
MODF
00
SOD
0
SSM
0
SSI
0
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