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Table 22-9. SPI Slave (CPHA=0) Configuration (continued)
Register
Value
Comments
support MSB first transfer by writing to
SHIFTBUFBBS register instead.
SHIFTBUF(n+1)
Data to receive
Received data can be read from
SHIFTBUFBYS, use the Shifter Status
Flag to indicate when data can be read
using interrupt or DMA request. Can
support MSB first transfer by reading
from SHIFTBUFBIS register instead.
Table 22-10. SPI Slave (CPHA=1) Configuration
Register
Value
Comments
SHIFTCFGn
0x0000_0001
Shifter configured to load on first shift
and stop bit disabled.
SHIFTCTLn
0x0003_0002
Configure transmit using Timer 0 on
rising edge of shift clock with output data
on Pin 0.
SHIFTCFG(n+1)
0x0000_0000
Start and stop bit disabled.
SHIFTCTL(n+1)
0x0080_0101
Configure receive using Timer 0 on
falling edge of shift clock with input data
on Pin 1.
TIMCMPn
0x0000_003F
Configure 32-bit transfer. Set
TIMCMP[15:0] = (number of bits x 2) - 1.
TIMCFGn
0x0120_6602
Configure start bit, enable on trigger
rising edge, disable on trigger falling
edge, initial clock state is logic 0 and
decrement on pin input.
TIMCTLn
0x06C0_0203
Configure 16-bit counter using Pin 2
input (shift clock), with Pin 3 input (slave
select) as the inverted trigger.
SHIFTBUFn
Data to transmit
Transmit data can be written to
SHIFTBUF, use the Shifter Status Flag
to indicate when data can be written
using interrupt or DMA request. Can
support MSB first transfer by writing to
SHIFTBUFBBS register instead.
SHIFTBUF(n+1)
Data to receive
Received data can be read from
SHIFTBUFBYS, use the Shifter Status
Flag to indicate when data can be read
using interrupt or DMA request. Can
support MSB first transfer by reading
from SHIFTBUFBIS register instead.
Chapter 22 Flexible I/O (FlexIO)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
581
Содержание K32 L2A Series
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