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45.3.1.18.2 Diagram
Bits
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
45.3.1.18.3 Fields
Field
Function
31-0
DATA
Receive Data
45.4 Functional description
45.4.1 Clocking and resets
Table 45-5. Clocks
LPSPI Functional clock
• The LPSPI functional clock is asynchronous to the bus clock.
• If the LPSPI functional clock remains enabled in low power modes, then LPSPI can perform
SPI bus transfers and low power wakeups, in both master and slave modes.
• The LPSPI divides the functional clock by a prescaler; the resulting frequency must be at least
2 times faster than the SPI external clock frequency (LPSPI_SCK).
External clock
• The LPSPI shift register is clocked directly by the LPSPI_SCK clock.
• How the LPSPI_SCK clock is generated or supplied depends upon the mode (master or
slave):
• in master mode: the LPSPI_SCK clock is generated internally.
• in slave mode: the LPSPI_SCK clock is supplied externally.
Bus clock
The bus clock is only used for bus accesses to the LPSPI control and configuration registers. The
bus clock frequency must be high enough to support the data bandwidth requirements of the LPSPI
registers, including the FIFOs.
Table 45-6. Resets
Chip reset
Resets the LPSPI logic and registers to their default state.
Table continues on the next page...
Chapter 45 Low Power Serial Peripheral Interface (LPSPI)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
1397
Содержание MWCT101 S Series
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