45.3.1.8.2 Diagram
Bits
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
0
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
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
45.3.1.8.3 Fields
Field
Function
31-10
—
Reserved
9
RDMO
Receive Data Match Only
When Receive Data Match Only is enabled, all received data that does not cause the Data Match Flag
(SR[DMF]) to set is discarded.
• Receive Data Match Only bit should be set when the LPSPI is idle and the Data Match Flag is clear
• After the Data Match Flag (DMF) is set, the Receive Data Match Only bit configuration is ignored
• When disabling RDMO and to ensure that no receive data is lost, before clearing the Data Match
Flag, first clear Receive Data Match Only (RDMO)
0b - Received data is stored in the receive FIFO as in normal operations
1b - Received data is discarded unless the Data Match Flag (DMF) is set
8
CIRFIFO
Circular FIFO Enable
When enabled, the transmit FIFO read pointer is saved to a temporary register. The transmit FIFO will be
emptied as it normally is, but after the LPSPI is idle and the transmit FIFO is empty, then the read pointer
value will be restored from the temporary register. This restoring of the read pointer will cause the
contents of the transmit FIFO to be cycled through repeatedly.
0b - Circular FIFO is disabled
1b - Circular FIFO is enabled
7-3
—
Reserved
2
HRSEL
Host Request Select
Selects the source of the host request input. When the host request function is enabled with the
LPSPI_HREQ pin, the LPSPI_PCS[1] function is disabled.
0b - Host request input is the LPSPI_HREQ pin
1b - Host request input is the input trigger
1
HRPOL
Host Request Polarity
Configures the polarity of the host request pin.
0b - Active low
Table continues on the next page...
Chapter 45 Low Power Serial Peripheral Interface (LPSPI)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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Содержание MWCT101 S Series
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