MMDS05 CONFIGURATION AND OPERATION
M68HC05E24/D2
2-3
MOTOROLA
2.1.3 Clock Source Select Headers (J3, J4)
Jumper headers J3 and J4 determines the source of the clock signal. The diagram below
shows the factory configuration of these jumpers: the fabricated jumper between pins 2 and 3
of J4 selects the E24EM canned oscillator clock source.
1
2
3
FABRICATED
JUMPER
FABRICATED
JUMPER
J3
FABRICATED
JUMPER
(J4)
Target
1
2
3
FABRICATED
JUMPER
J4
EM
MMDS
Alternatively, you may use a clock source originating from the MMDS05 control board. To do
so, reposition the J4 jumper between pins 1 and 2. The MMDS OSC command can then be
used to select clock frequency.
Jumper J3 can be used to select between an internal generated clock or a external clock
generated by the target system. If the target clock is selected by placing the jumper on J3
between pins 1 and 2, the position of J4 is not important.
2.1.4 Platform Board Select Header (J5)
The factory configuration of header J5 is shown below. The fabricated jumper must be
installed between pins 2 and 3 for MMDS operation.
1
2
3
FABRICATED
JUMPER
J5
EM
MMDS
NOTE: The only valid position of the J5 fabricated jumper is between pins 2 and 3 when using
the E24EM as part of an MMDS system.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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