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Motorola M68CPU32BUG Manuel d'utilisateur Page 13

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HARDWARE PREPARATION AND INSTALLATION
M68332BCC/D 2-3 MOTOROLA
REV 1
Table 2-1. Jumper Header Types
Jumper Header
Type
(1)
Symbol Description
three-pin with jumper Three-pin jumper header with jumper and designated as JX (X =
the jumper header number). To change the factory jumper header
configuration, move the jumper to the two desired pins.
two-pin with jumper Two-pin jumper header with jumper, designated as JX (X = the
jumper header number).
1. J7 and J8 are designated as jumper headers but they are in fact connectors.
Table 2-2. Jumper Header Summary
Jumper
Header Type Description
J1
(1)
2
1
Jumper between pins 1 and 2 (factory default); disables (grounds) the on-board
RAM (U1 & U3) voltage standby power (VSTBY) input pin. VSTBY maintains
the data in RAM if BCC power (+5Vdc) is turned off.
No jumper; enables the on-board RAM VSTBY function. The VSTBY voltage
must be supplied by the user.
J2
(1)
3
2
1
Jumper between pins 1 and 2 (factory default); enables the on-board RAM
chips (U1 & U3).
Jumper between pins 2 and 3; disables the on-board RAM chips. This allows
the chip select to be used with off-board memory.
J3
(1)
3
2
1
Jumper between pins 1 and 2 (factory default); enables the on-board EPROM at
U2.
Jumper between pins 2 and 3; disables the on-board EPROM at U2. This allows
the chip select to be used to boot from off-board memory.
J4
(1)
2
1
Jumper between pins 1 and 2 (factory default); connects the on-board transmit
data serial communication drivers to the MC68332 MCU device.
No jumper; disconnects the on-board transmit data serial communication drivers
from the MC68332 MCU device. This allows connection of the MCU serial port
to off board logic.
1. These jumper headers are shorted by a trace on the solder side of the PCB (between the pins), as
shown in the schematics. Cut the trace when using the optional feature provided by the jumper.
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