FlexIO does not support automatic verification of parity bits.
Table 47-4. UART Receiver Configuration
Register
Value
Comments
SHIFTCFGn
0x0000_0032
Configure start bit of 0 and stop bit of 1.
SHIFTCTLn
0x0080_0001
Configure receive using Timer 0 on
negedge of clock with input data on Pin
0. Can invert input data by setting
PINPOL.
TIMCMPn
0x0000_0F01
Configure 8-bit transfer with baud rate of
divide by 4 of the FlexIO clock. Set
TIMCMP[15:8] = (number of bits x 2) - 1.
Set TIMCMP[7:0] = (baud rate divider /
2) - 1.
TIMCFGn
0x0204_2422
Configure start bit, stop bit, enable on
pin posedge and disable on compare.
Enable resynchronization to received
data with TIMOUT=0x2 and
TIMRST=0x4.
TIMCTLn
0x0000_0081
Configure dual 8-bit counter using
inverted Pin 0 input.
SHIFTBUFn
Data to receive
Received data can be read from
SHIFTBUFBYS[7:0], 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[7:0] register
instead.
The UART Receiver with RTS configuration uses a 2nd Timer to generate the RTS
output. The RTS will assert when the start bit is detected and negate when the data is read
from the shifter buffer register. No start bit will be detected while the RTS is asserted, the
received data is simply ignored.
Table 47-5. UART Receiver with RTS Configuration
Register
Value
Comments
SHIFTCFGn
0x0000_0032
Configure start bit of 0 and stop bit of 1.
SHIFTCTLn
0x0080_0001
Configure receive using Timer 0 on
negedge of clock with input data on Pin
0. Can invert input data by setting
PINPOL.
TIMCMPn
0x0000_0F01
Configure 8-bit transfer with baud rate of
divide by 4 of the FlexIO clock. Set
TIMCMP[15:8] = (number of bits x 2) - 1.
Set TIMCMP[7:0] = (baud rate divider /
2) - 1.
TIMCFGn
0x0204_2522
Configure start bit, stop bit, enable on
pin posedge with trigger low and disable
on compare. Enable resynchronization
Table continues on the next page...
Application Information
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
1252
NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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