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HARDWARE PREPARATION AND INSTALLATION
2.2.5
MCU Clock Source Select Header (W5)
Jumper header W5 selects the MCU clock; either the MCU-internal phase-lock-
loop frequency synthesizer or the EXTAL input. The drawing below shows the
factory configuration: fabricated jumper on pins 1 and 2. This configuration
selects the MCU-internal phase-lock-loop frequency synthesizer as the clock. To
use the EXTAL input as the clock, place the fabricated jumper on 2 and 3.
2-8
J14 pin-4 and W16 on the MPFB are marked MODCLK, but this
signal, when using an M68HC916R3, is FASTREF. The
M68HC916R3 MEVB overlay is correct and marked FASTREF.
Use W16 on the MPFB to select the MCU PLL clock input speed.
W5
1
2
3
NOTE
M68MPB16R3UM/D
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