MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 283

• Manufacturer Part Number: MC9S12E32CFU
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

9.3.2.3
Read: anytime
Write: anytime; writes to the reserved bits have no effect
The baud rate divisor equation is as follows:
The baud rate can be calculated with the following equation:
Freescale Semiconductor
SPPR[2:0]
SPR[2:0}
Reset
Field
6:4
2:0
W
R
SPI Baud Rate Preselection Bits — These bits specify the SPI baud rates as shown in
mode, a change of these bits will abort a transmission in progress and force the SPI system into idle state.
SPI Baud Rate Selection Bits — These bits specify the SPI baud rates as shown in
a change of these bits will abort a transmission in progress and force the SPI system into idle state.
SPI Baud Rate Register (SPIBR)
0
0
7
= Unimplemented or Reserved
SPPR2
0
6
Figure 9-5. SPI Baud Rate Register (SPIBR)
BaudRateDivisor
Baud Rate
Table 9-6. SPIBR Field Descriptions
SPPR1
MC9S12E128 Data Sheet, Rev. 1.07
0
5
=
BusClock BaudRateDivisor
SPPR0
=
0
4
SPPR
Description
+
1
0
0
3
2
SPR
Chapter 9 Serial Peripheral Interface (SPIV3)
+
1
SPR2
0
2
Table
SPR1
Table
0
1
9-7. In master mode,
9-7. In master
SPR0
0
0
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