LPTMRx_PSR field descriptions
Field Description
31–7
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
6–3
PRESCALE
Prescale Value
Configures the size of the Prescaler in Time Counter mode or width of the glitch filter in Pulse Counter
mode. PRESCALE must be altered only when the LPTMR is disabled.
0000 Prescaler divides the prescaler clock by 2; glitch filter does not support this configuration.
0001 Prescaler divides the prescaler clock by 4; glitch filter recognizes change on input pin after 2 rising
clock edges.
0010 Prescaler divides the prescaler clock by 8; glitch filter recognizes change on input pin after 4 rising
clock edges.
0011 Prescaler divides the prescaler clock by 16; glitch filter recognizes change on input pin after 8
rising clock edges.
0100 Prescaler divides the prescaler clock by 32; glitch filter recognizes change on input pin after 16
rising clock edges.
0101 Prescaler divides the prescaler clock by 64; glitch filter recognizes change on input pin after 32
rising clock edges.
0110 Prescaler divides the prescaler clock by 128; glitch filter recognizes change on input pin after 64
rising clock edges.
0111 Prescaler divides the prescaler clock by 256; glitch filter recognizes change on input pin after 128
rising clock edges.
1000 Prescaler divides the prescaler clock by 512; glitch filter recognizes change on input pin after 256
rising clock edges.
1001 Prescaler divides the prescaler clock by 1024; glitch filter recognizes change on input pin after 512
rising clock edges.
1010 Prescaler divides the prescaler clock by 2048; glitch filter recognizes change on input pin after
1024 rising clock edges.
1011 Prescaler divides the prescaler clock by 4096; glitch filter recognizes change on input pin after
2048 rising clock edges.
1100 Prescaler divides the prescaler clock by 8192; glitch filter recognizes change on input pin after
4096 rising clock edges.
1101 Prescaler divides the prescaler clock by 16,384; glitch filter recognizes change on input pin after
8192 rising clock edges.
1110 Prescaler divides the prescaler clock by 32,768; glitch filter recognizes change on input pin after
16,384 rising clock edges.
1111 Prescaler divides the prescaler clock by 65,536; glitch filter recognizes change on input pin after
32,768 rising clock edges.
2
PBYP
Prescaler Bypass
When PBYP is set, the selected prescaler clock in Time Counter mode or selected input source in Pulse
Counter mode directly clocks the CNR. When PBYP is clear, the CNR is clocked by the output of the
prescaler/glitch filter. PBYP must be altered only when the LPTMR is disabled.
0 Prescaler/glitch filter is enabled.
1 Prescaler/glitch filter is bypassed.
PCS Prescaler Clock Select
Selects the clock to be used by the LPTMR prescaler/glitch filter. PCS must be altered only when the
LPTMR is disabled. The clock connections vary by device.
NOTE:
See the chip configuration details for information on the connections to these inputs.
Table continues on the next page...
Chapter 41 Low-Power Timer (LPTMR)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 1045
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