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Hardware Preparation
2.2.1
Setting the VDDL Supply Voltage Level
The level of V DDL is tuned using RP1 and is in the range of 1.3 V to 1.7 V. V DDL may be
measured upon JP13, using a DVM or any other high-input impedance voltage measuring
device.
V DDL level is factory-set at the mid-range, but may be changed using RP1. Rotating RP1
CCW increases V DDL voltage up to range-high. Rotating it clockwise decreases V DDL
down to range-low. LD27 provides visual indication for V DDL level. It illuminates brighter
with the rise of V DDL . V DDL changes Vs. RP1’s rotation direction is shown in Figure 2-2.
RP1
HIGH
LOW
Figure 2-2. V DDL Trimmer — RP1
2.2.2
Setting MODCK(1:3) for PLLs Multiplication
Factor—SW5 (#6–#8)
After 1K cycles and negation of the power-on reset signal, the MPC8272 samples the seven
MODCK lines—the lower 3 on MODCK(1-3) and the upper four—MODCKH(0:3) field
to establish the multiplication factors of the CPM’s and core’s PLLs. The levels on
MODCK(1:3) lines are set using SW5 (see Figure 2-3), switches #6–#8. When an
individual switch is at the OFF position, its associated MODCK line is pulled-high (‘1’).
When at the ON position, the associated MODCK is pulled-down (‘0’). SW5 is shown in
Figure 2-3, while the various combinations for SW5 (#6 - #8) and their associated
MODCK(1:3) values are shown in Table 2-1.
Chapter 2. Hardware Preparation and Installation
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