Motorola M68CPU32BUG Manuel d'utilisateur Page 21

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HARDWARE PREPARATION AND INSTALLATION
M68332BCC/D 2-11 MOTOROLA
REV 1
An optional high frequency oscillator (0 to 16.77 MHz) may be used if MODCK (connector P2,
pin 28) is pulled to a logic low level. To use the target-system, external-source CMOS clock;
follow these steps:
a. Turn off power to the BCC.
b. Cut the printed circuit trace on the bottom of the BCC between pins 2 and 3.
c. Move the fabricated jumper between pins 2 and 3 to pins 1 and 2.
d. Supply an external oscillator to connector P2, pin 59 (EXTAL).
e. Ground connector P2, pin 28 (MODCK).
f. Apply power to the BCC, start the external oscillator, and drive connector P1, pin 57
(RESET), low.
NOTES
If the cut-trace short on jumper header J6 is cut, the fabricated jumper must be
reinstalled on J6 pins 2 and 3 to return the BCC to its default setting.
Use a hybrid oscillator when driving the MCU from an external source.
Any change in the MC68332 MCU device clock speed causes a corresponding
change in the SCI baud rate. The operational speed of the MCU is determined
by the clock and the synthesizer control register value (SYNCR). The SCI
baud rate is then set based on this system clock frequency. If changes are
made to the MCU speed and the terminal baud rate is not changed
appropriately, terminal communication will fail. Refer to Appendix C of the
M68CPU32BUG Debug Monitor User’s Manual, M68CPU32BUG/AD1.
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