Motorola M68CPU32BUG Manuel d'utilisateur Page 20

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HARDWARE PREPARATION AND INSTALLATION
M68332BCC/D 2-10 MOTOROLA
REV 1
2.3.6 Clock Input Select Header (J6)
Use the three-pin jumper header J6 (shown below) to select the BCC on-board clock source or an
external clock source. The BCC on-board clock source is a 32 kHz crystal, which is frequency
multiplied by the MC68332 to a programmable operating frequency. The BCC is shipped with
the on-board crystal selected as the clock source. J6 has a cut-trace short on the bottom of the
BCC PCB between pins 2 and 3. A fabricated jumper is also supplied, but is not required when
the user uses the on-board clock source. Refer to the BCC schematic diagram for more detail on
EXTAL signal wiring.
62
2
1
J6
U5
EXTAL
P2
59
MC68332 MCU
64-Pin Expansion Connector
XTAL
60
3
BCC
On-Board
Oscillator
EXTAL
Fabricated Jumper
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