参数资料
型号: EM250-RCM-R
厂商: Silicon Laboratories Inc
文件页数: 61/124页
文件大小: 0K
描述: EM250 RCM BOARD
标准包装: 12
类型: 收发器,802.15.4/Zigbee
频率: 2.4GHz
适用于相关产品: EM250
其它名称: 636-1023
EM250
5.3.1
SPI Modes
The SPI mode of the SC2 supports both master and slave modes. It has a fixed word length of 8 bits. The SC2
SPI controller is enabled with SC2_MODE set to 2.
The SC2 SPI mode has the following features:
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Master and slave modes
Full duplex operation
Programmable master mode clock frequency (12MHz max.)
Slave mode up to 5MHz bit rate
Programmable clock polarity and clock phase
Selectable data shift direction (either LSB or MSB first)
Optional slave select input
The following signals can be made available on the GPIO pins:
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MOSI (master out/slave in)
MISO (master in/slave out)
MSCLK (serial clock)
nSSEL (slave select—only in slave mode)
5.3.1.1
SPI Master Mode
The SC2 SPI Master controller is enabled with the SC_SPIMST set in the SC2_SPICFG register.
The SC2 SPI module obtains its reference clock from a programmable clock generator. Clock rates are set by a
clock division ratio from the 24MHz clock:
rate = 24MHz / ( 2 * (LIN + 1) * 2 EXP )
EXP is written to the SC2_RATEEXP register and LIN to the SC2_RATELIN register. Since the range for both
values is 0 to 15, the fastest data rate is 12Mbps and the slowest is 22.9bps.
The SC2 SPI Master supports various frame formats depending upon the clock polarity ( SC_SPIPOL ), clock
phase ( SC_SPIPHA ), and direction of data ( SC_SPIORD ) (see Table 24). The register bits SC_SPIPOL ,
SC_SPIPHA , and SC_SPIORD are defined within the SC2_SPICFG register.
Note:
Switching the SPI configuration from SC_SPIPOL=1 to SC_SPIPOL=0 without subsequently setting
SC2_MODE=0 and reinitializing the SPI will cause an extra byte ( 0xFE ) to be transmitted immediately
before the first intended byte.
Page 61
120-0082-000V Rev 1.1
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