Table 42-12. Signal properties in automatic noise operation mode (continued)
Name Function I/O type Power Up/Reset state
EXTCHRG[2:1] In this operation mode these
bits select the number of filter
bits.
00 - 3 filter bits
01 - 2 filter bits
10 - 1 filter bit
11 - no filter bit
I 00
EXTCHRG[0] In this operation mode this
bits selects the series
resistance.
0 - uses Rs=32 kΩ
0 - uses Rs=187 kΩ
Independent of this bit
selection the threshold 15 is
done with Rs = 5.5 kΩ
I 0
DVOLT[1:0] Select voltage rails of the
internal oscillator
I 00
MODE[3:0] DVOLT counter bits output.
This register content is reset
always the MODE[3:2] is not
11, and after beginning of
automatic noise mode
operation.
O 0000
42.4.13.2 Single threshold noise modes
These modes reset by MODE[3:2]=01 and 10. The difference between these two modes
is that in mode 2 (MODE[3:2]=10) there is a frequency limitation circuit that enables the
circuit to operate in higher frequencies. In mode 1 (MODE[3:2]=01) this frequency
limitation circuit is not enabled.
In this mode the thresholds are set by user via register bits as described in the following
table.
During these modes the internal oscillator rails are set to the maximum (equivalent to
DVOLT[1:0]=00).
Table 42-13. Signal properties in single noise modes (1,2)
Name Function I/O type Power up /
reset
MODE[3:2] 01 or 10- Single thrshold noise mode operation. I 00
Table continues on the next page...
Functional description
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
804 Freescale Semiconductor, Inc.
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