Datasheet

Bits 1:0 – SPR1 [1:0] SPI1 Clock Rate Select
These two bits control the SCK rate of the device configured as a Master. SPR1 and SPR0 have no effect
on the Slave. The relationship between SCK and the Oscillator Clock frequency f
osc
is shown in the table
below.
Table 23-8. Relationship Between SCK and Oscillator Frequency
SPI2X SPR1[1] SPR1[0] SCK Frequency
0 0 0 f
osc
/4
0 0 1 f
osc
/16
0 1 0 f
osc
/64
0 1 1 f
osc
/128
1 0 0 f
osc
/2
1 0 1 f
osc
/8
1 1 0 f
osc
/32
1 1 1 f
osc
/64
ATmega328PB
SPI – Serial Peripheral Interface
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001906C-page 257