Motorola M68HC11EVBU User Manual page 33

Jumper header J1 is used to select the input power to be applied to the EVBU. The EVBU is
factory-configured and shipped with the fabricated jumper installed on pins 1 and 2 as shown
below. In this configuration, you must supply +5.0 Vdc @ 50 mA (max) to the input power
connector P1.
Fabricated Jumper
If a +5 Vdc power supply is not available, an alternate power source (+7.5 to +14.0 Vdc) can be
connected to the input power connector P1. To utilize this secondary power source, install an
MC78L05C voltage regulator at location U1. Upon completion of the voltage regulator
installation, you must reinstall the fabricated jumper on jumper header J1, from pins 1 and 2 to
pins 2 and 3.
M68HC11EVBU/D
HARDWARE PREPARATION AND INSTALLATION
J1
1 +5 Vdc
2
3
+7.5 to +14.0 Vdc
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