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31.3.2 SPI Baud Rate Register (SPIx_BR)
Use this register to set the prescaler and bit rate divisor for an SPI master. This register
may be read or written at any time.
Address: Base a 1h offset
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
0
0
0
0
0
0
0
0
SPIx_BR field descriptions
Field
Description
7
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
6–4
SPPR[2:0]
SPI Baud Rate Prescale Divisor
This 3-bit field selects one of eight divisors for the SPI baud rate prescaler. The input to this prescaler is
the SPI module clock. The output of this prescaler drives the input of the SPI baud rate divider. Refer to
the description of “SPI Baud Rate Generation” for details.
000
Baud rate prescaler divisor is 1.
001
Baud rate prescaler divisor is 2.
010
Baud rate prescaler divisor is 3.
011
Baud rate prescaler divisor is 4.
100
Baud rate prescaler divisor is 5.
101
Baud rate prescaler divisor is 6.
110
Baud rate prescaler divisor is 7.
111
Baud rate prescaler divisor is 8.
SPR[3:0]
SPI Baud Rate Divisor
This 4-bit field selects one of nine divisors for the SPI baud rate divider. The input to this divider comes
from the SPI baud rate prescaler. Refer to the description of “SPI Baud Rate Generation” for details.
0000
Baud rate divisor is 2.
0001
Baud rate divisor is 4.
0010
Baud rate divisor is 8.
0011
Baud rate divisor is 16.
0100
Baud rate divisor is 32.
0101
Baud rate divisor is 64.
0110
Baud rate divisor is 128.
0111
Baud rate divisor is 256.
1000
Baud rate divisor is 512.
All others Reserved
Chapter 31 Serial Peripheral Interface (SPI)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
587
Содержание MKW01Z128
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