mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 442
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mc9s12xs128
Manufacturer Part Number
mc9s12xs128
Description
Hcs12 Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XS128.pdf
(738 pages)
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Serial Peripheral Interface (S12SPIV5)
15.3.2.3
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:
442
Module Base +0x0002
SPPR[2:0]
SPR[2:0]
Reset
SPPR2
Field
6–4
2–0
0
0
0
0
0
0
0
0
0
0
0
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.
Table 15-7. Example SPI Baud Rate Selection (25 MHz Bus Clock) (Sheet 1 of 3)
SPI Baud Rate Register (SPIBR)
0
0
7
For maximum allowed baud rates, please refer to the SPI Electrical
Specification in the Electricals chapter of this data sheet.
SPPR1
0
0
0
0
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
SPPR2
0
6
Baud Rate = BusClock / BaudRateDivisor
BaudRateDivisor = (SPPR + 1) • 2
SPPR0
0
0
0
0
0
0
0
0
1
1
1
1
Figure 15-5. SPI Baud Rate Register (SPIBR)
S12XS Family Reference Manual, Rev. 1.10
Table 15-6. SPIBR Field Descriptions
SPPR1
0
5
SPR2
0
0
0
0
1
1
1
1
0
0
0
0
SPPR0
NOTE
SPR1
0
4
0
0
1
1
0
0
1
1
0
0
1
1
Description
SPR0
(SPR + 1)
0
0
0
1
0
1
0
1
0
1
0
1
0
1
3
Baud Rate
SPR2
Divisor
0
2
128
256
16
32
64
16
32
2
4
8
4
8
Table
Freescale Semiconductor
SPR1
15-7. In master mode,
0
Table
1
1.5625 Mbit/s
1.5625 Mbit/s
781.25 kbit/s
390.63 kbit/s
195.31 kbit/s
781.25 kbit/s
3.125 Mbit/s
3.125 Mbit/s
97.66 kbit/s
Baud Rate
12.5 Mbit/s
6.25 Mbit/s
6.25 Mbit/s
15-7. In master
Eqn. 15-1
Eqn. 15-2
SPR0
0
0
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