参数资料
型号: EM250-RCM-R
厂商: Silicon Laboratories Inc
文件页数: 43/124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
Table 21. SC1 SPI Master Frame Format
SC1_SPICFG
Frame Format
2
1
0
0
0
SC1-3M
mode
MCLK out
MO out
TX[7]
TX[6]
TX[5]
TX[4]
TX[3]
TX[2]
TX[1]
TX[0]
MI in
RX[7]
RX[6]
RX[5]
RX[4]
RX[3]
RX[2]
RX[1]
RX[0]
2
1
0
0
1
SC1-3M
mode
MCLK out
MO out
TX[7]
TX[6]
TX[5]
TX[4]
TX[3]
TX[2]
TX[1]
TX[0]
MI in
RX[7]
RX[6]
RX[5]
RX[4]
RX[3]
RX[2]
RX[1]
RX[0]
2
1
0
1
0
SC1-3M
mode
MCLK out
MO out
TX[7]
TX[6]
TX[5]
TX[4]
TX[3]
TX[2]
TX[1]
TX[0]
MI in
RX[7]
RX[6]
RX[5]
RX[4]
RX[3]
RX[2]
RX[1]
RX[0]
2
1
0
1
1
SC1-3M
mode
MCLK out
MO out
TX[7]
TX[6]
TX[5]
TX[4]
TX[3]
TX[2]
TX[1]
TX[0]
MI in
RX[7]
RX[6]
RX[5]
RX[4]
RX[3]
RX[2]
RX[1]
RX[0]
2
1
1
-
-
SC1-3M
Same as above except LSB first instead of MSB first
mode
2
2
1
1
-
-
-
-
-
-
SC1-2 mode
SC1-4A
Illegal
Illegal
mode
Serialized SC1 SPI transmit data is driven to the output pin MO. SC1 SPI master data is received from the input
pin MI. To generate slave select signals to SPI slave devices, other GPIO pins have to be used and their
assertion must be controlled by software.
Characters transmitted and received are passed through transmit and receive FIFOs. The transmit and receive
FIFOs are 4 bytes deep. These FIFOs are accessed under software control by accessing the SC1_DATA data
register or under hardware control using a DMA controller.
When a transmit character is written to the (empty) transmit FIFO, the register bit SC_SPITXIDLE in the
SC1_SPISTAT register clears and indicates that not all characters are transmitted yet. Further transmit
characters can be written to the transmit FIFO until it is full, which causes the register bit SC_SPITXFREE in
the SC1_SPISTAT register to clear. After shifting one transmit character to the MO pin, space for one transmit
character becomes available in the transmit FIFO. This causes the register bit SC_SPITXFREE in the
SC1_SPISTAT register to get set. After all characters are shifted out, the transmit FIFO empties, which causes
the register bit SC_SPITXIDLE in the SC1_SPISTAT register to get set also.
Any character received is stored in the (empty) receive FIFO. The register bit SC_SPIRXVAL in the
SC1_SPISTAT register is set to indicate that not all received characters are read out from receive FIFO. If
software or DMA is not reading from the receive FIFO, the receive FIFO will store up to 4 characters. Any
Page 43
120-0082-000V Rev 1.1
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