mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 415
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mc9s12q128
Manufacturer Part Number
mc9s12q128
Description
Hcs12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12Q128.pdf
(644 pages)
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14.3.2.3
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
Module Base 0x0002
SPPR[2:0]
SPR[2:0}
Reset
Field
6:4
2:0
W
R
Bidirectional
Pin Mode
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
Table 14-5. Bidirectional Pin Configurations (continued)
0
6
SPC0
1
Figure 14-5. SPI Baud Rate Register (SPIBR)
BaudRateDivisor
Table 14-6. SPIBR Field Descriptions
Baud Rate
SPPR1
BIDIROE
0
5
0
1
=
BusClock BaudRateDivisor
MC9S12Q128
SPPR0
Rev 1.09
=
0
4
SPPR
Description
Chapter 14 Serial Peripheral Interface (SPIV3) Block Description
Slave I/O
Slave In
MISO
+
1
0
0
3
2
SPR
+
1
SPR2
0
2
MOSI not used by SPI
Table
MOSI
SPR1
Table
14-7. In master mode,
0
1
14-7. In master
SPR0
0
0
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