Motorola M68CPU32BUG Manuel d'utilisateur télécharger pdf (Page 15)

HARDWARE PREPARATION AND INSTALLATION

M68332BCC/D 2-5 MOTOROLA

REV 1

2.3.1 V

STBY

Select Header (J1)

Use the two-pin jumper header J1 (shown below) to select a voltage standby (V

STBY

) power

supply source. V

STBY

provides battery backup to the RAM contained in the MC68332 MCU

device. The BCC is shipped from the factory with V

STBY

connected to ground (GND) via J1

cut-trace short. To power V

STBY

with an external supply, cut the trace on the bottom of the

PCB and connect an external power supply between P1, pin 28 and any BCC ground pin. Refer

to the BCC schematic diagram for more detail on V

STBY

signal wiring.

MC68332 MCU

64-Pin Expansion Connector

GND

STBY

Fabricated Jumper

NOTE

If the cut-trace short on jumper header J1 is cut, a user-supplied fabricated

jumper must be installed on J1 to return the BCC to its default setting.

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Motorola M68CPU32BUG Manuel d'utilisateur Page 15