Fujitsu MB86R02 Jade-D Hardware Manual page 358

MB86R02 'Jade-D' Hardware Manual V1.64
10 = Input to the oscillator is an external XTAL which uses an internal feedback resistor
11 = Input to the oscillator is an external XTAL which uses an external feedback resistor
OSC_BIAS[1:0]
Sets the internal oscillator's bias level for 4 configurable settings which provide a compromise
between clock jitter and current consumption:
00 = Highest clock jitter, lowest current consumption
01 = High clock jitter, lower current consumption
10 = Low clock jitter, high current consumption
11 = Lowest clock jitter, highest current consumption
Note:
Until the chip has been validated and real life values measured, it is not possible to make a fixed
recommendation for a specific application. However, until then, setting 11 makes the most sense
(best clock characteristics, but higher current consumption).
OSC_FILTER
Sets the characteristics of an internal low-pass post-oscillator filter. This filter is integrated in order to
improve the robustness of the internal circuit to external RF interference signals. The cut-off
frequency of this filter is programmable to allow a clock of either 62.5 MHz or 20 MHz. OSCFilter
should not be changed when the clock from the oscillator is being used and it is therefore
implemented as an external pin for setup.
The setting that should be used depends on the clock frequency:
0 = max. clock of 62.5 MHz
1 = max. clock of 20 MHz
17-45