C8051F000DK-A Silicon Laboratories Inc, C8051F000DK-A Datasheet - Page 126
C8051F000DK-A
Manufacturer Part Number
C8051F000DK-A
Description
DEV KIT FOR C8051F000/F001/F002
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F005-TB.pdf
(171 pages)
Specifications of C8051F000DK-A
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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in an “off-line” state. In a multiple-master environment, the system controller should check the state of the
SLVSEL flag (SPI0CN.2) to ensure the bus is free before setting the MSTEN bit and initiating a data transfer.
17.3.
As shown in Figure 17.4, four combinations of serial clock phase and polarity can be selected using the clock
control bits in the SPI Configuration Register (SPI0CFG). The CKPHA bit (SPI0CFG.7) selects one of two clock
phases (edge used to latch the data). The CKPOL bit (SPI0CFG.6) selects between an active-high or active-low
clock. Both master and slave devices must be configured to use the same clock phase and polarity. Note: the SPI
should be disabled (by clearing the SPIEN bit, SPI0CN.0) while changing the clock phase and polarity.
The SPI Clock Rate Register (SPI0CKR) as shown in Figure 17.7 controls the master mode serial clock frequency.
This register is ignored when operating in slave mode.
Serial Clock Timing
MISO/MOSI
SCK
(CKPOL = 0, CKPHA = 0)
SCK
(CKPOL = 0, CKPHA = 1)
SCK
(CKPOL = 1, CKPHA = 0)
SCK
(CKPOL = 1, CKPHA = 1)
NSS
Figure 17.4. Data/Clock Timing Diagram
MSB
Bit 6
Rev. 1.7
Bit 5
Bit 4
Bit 3
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
Bit 2
Bit 1
LSB
126
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