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enabling bit clock and frame sync generation. Data transfers can be supported using the
DMA controller and the shifter error flag will set on transmit underrun or receive
overflow.
The bit clock frequency is an even integer divide of the FlexIO clock frequency, and the
initial frame sync assertion occurs at the same time as the first bit clock edge. The timer
uses the start bit to ensure the frame sync is generated one clock cycle before the first
output data.
Due to synchronization delays, the setup time for the receiver input is 1.5 FlexIO clock
cycles, so the maximum baud rate is divide by 4 of the FlexIO clock frequency.
Table 22-12. I2S Master Configuration
Register
Value
Comments
SHIFTCFGn
0x0000_0001
Load transmit data on first shift and stop
bit disabled.
SHIFTCTLn
0x0003_0002
Configure transmit using Timer 0 on
rising edge of 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 clock with input data on
Pin 1.
TIMCMPn
0x0000_3F01
Configure 32-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
0x0000_0202
Configure start bit, enable on trigger high
and never disable. Initial clock state is
logic 1.
TIMCTLn
0x01C3_0201
Configure dual 8-bit counter using Pin 2
output (bit clock), with Shifter 0 flag as
the inverted trigger. Set PINPOL to
invert the output shift clock.
TIMCMP(n+1)
0x0000_007F
Configure 32-bit transfer with baud rate
of divide by 4 of the FlexIO clock. Set
TIMCMP[15:0] = (number of bits x baud
rate divider) - 1.
TIMCFG(n+1)
0x0000_0100
Enable when Timer 0 is enabled and
never disable.
TIMCTL(n+1)
0x0003_0383
Configure 16-bit counter using inverted
Pin 3 output (as frame sync).
SHIFTBUFn
Data to transmit
Transmit data can be written to
SHIFTBUFBIS, use the Shifter Status
Flag to indicate when data can be
written using interrupt or DMA request.
Can support LSB first transfer by writing
to SHIFTBUF register instead.
Table continues on the next page...
Application Information
K32 L2A Reference Manual, Rev. 2, 01/2020
584
NXP Semiconductors
Содержание K32 L2A Series
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