Configuration Of The Pll - Motorola EVB555 Quick Reference

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The MPC555 can work with varying external clock generation. The configuration of the
microcontroller for the clock used takes place before the operating voltage is applied.
The MODCK setting makes it possible to configure the PLL of the MPC555. Only a few
of the possible settings are useful due to the design of the EVB555:
MODCK
1 2
0 1
1 0
1 0
1 1
1 1
Please consult the MPC555 User Manual for an explanation of the PLL function and
limp mode.
The standard setting for the evaluation board should be "010". The PLL works using
the quartz crystal assembled on the EVB555 (4 MHz) whereby the limp mode is
enabled.
EVB555
Quick Reference
LME MF+1 Timing Reference
3
freq
0 1 5
freq
0 0 1
freq
1 0 1
freq
0 0 5
freq
1 1 1
Table 4-2 PLL configuration
= 4 MHz, limb mode enabled
(OSCM)
= freq , limp mode disabled
clkout(max) (EXTCLK)
= freq , limp mode disabled
clkout(max) (EXTCLK)
= 4 MHz, limp mode disabled
(EXTCLK)
=freq , limp mode enabled
clkout (EXTCLK)
MOTOROLA
4-21