NXP Semiconductors MWCT101 S Series, Reference Manual

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46.3.1.8.2 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
RDMO
CIRFIFO
0
HRSE L
HRPOL
HRE N
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
46.3.1.8.3 Fields
Field Function
31-10
—
Reserved
9
RDMO
Receive Data Match Only
When enabled, all received data that does not cause the Data Match Flag (MSR[DMF]) to set is
discarded. After the Data Match Flag is set, the RDMO configuration is ignored. When disabling RDMO,
clear RDMO before clearing the Data Match Flag, to ensure that no receive data is lost.
0b - Received data is stored in the receive FIFO
1b - Received data is discarded unless the the Data Match Flag (MSR[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 normal, but after the LPI2C master is idle and the transmit FIFO is empty, then the read
pointer value will be restored from the temporary register. This will cause the contents of the transmit
FIFO to be cycled through repeatedly. If AUTOSTOP is set, then a STOP condition will be sent whenever
the transmit FIFO is empty and the read pointer is restored.
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 host request input is enabled, the Host Request
Select field should remain static (the Host Request Select should not change).
0b - Host request input is pin HREQ
1b - Host request input is input trigger
1
HRPOL
Host Request Polarity
Configures the polarity of the host request input pin. When host request input is enabled, the Host
Request Polarity field should remain static (Host Request Polarity should not change).
0b - Active low
1b - Active high
0
HREN
Host Request Enable
Chapter 46 Low Power Inter-Integrated Circuit (LPI2C)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors 1425