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PC912XDP512F0MPVR 데이터시트(PDF) 522 Page - Freescale Semiconductor, Inc

부품명 PC912XDP512F0MPVR
상세설명  HCS12X Microcontrollers
PDF  1348 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC912XDP512F0MPVR 데이터시트(HTML) 522 Page - Freescale Semiconductor, Inc

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Chapter 12 Serial Peripheral Interface (S12SPIV4)
MC9S12XDP512 Data Sheet, Rev. 2.21
522
Freescale Semiconductor
12.3.2.3
SPI Baud Rate Register (SPIBR)
Read: Anytime
Write: Anytime; writes to the reserved bits have no effect
The baud rate divisor equation is as follows:
BaudRateDivisor = (SPPR + 1)
• 2(SPR + 1)
Eqn. 12-1
The baud rate can be calculated with the following equation:
Baud Rate = BusClock / BaudRateDivisor
Eqn. 12-2
NOTE
For maximum allowed baud rates, please refer to the SPI Electrical
Specification in the Electricals chapter of this data sheet.
Table 12-4. Bidirectional Pin Configurations
Pin Mode
SPC0
BIDIROE
MISO
MOSI
Master Mode of Operation
Normal
0
X
Master In
Master Out
Bidirectional
1
0
MISO not used by SPI
Master In
1
Master I/O
Slave Mode of Operation
Normal
0
X
Slave Out
Slave In
Bidirectional
1
0
Slave In
MOSI not used by SPI
1
Slave I/O
76543210
R0
SPPR2
SPPR1
SPPR0
0
SPR2
SPR1
SPR0
W
Reset
00000000
= Unimplemented or Reserved
Figure 12-5. SPI Baud Rate Register (SPIBR)
Table 12-5. SPIBR Field Descriptions
Field
Description
6–4
SPPR[2:0]
SPI Baud Rate Preselection Bits — These bits specify the SPI baud rates as shown in Table 12-6. In master
mode, a change of these bits will abort a transmission in progress and force the SPI system into idle state.
2–0
SPR[2:0]
SPI Baud Rate Selection Bits — These bits specify the SPI baud rates as shown in Table 12-6. In master mode,
a change of these bits will abort a transmission in progress and force the SPI system into idle state.



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