Mcu Mode Select Headers (J3 And J4) - Motorola M68HC11EVBU User Manual

HARDWARE PREPARATION AND INSTALLATION
2.3.3

MCU Mode Select Headers (J3 and J4)

Use jumper headers J3 and J4 to select the MCU operation mode. The EVBU resident
M68HC11E9 MCU device (U3) is factory configured and shipped for single-chip mode of
operation. No fabricated jumpers are required on jumper headers J3 and J4 for this configuration
due to the cut-trace short on PCB solder side of J4.
If the J4 cut trace short is cut, you must install a user-supplied fabricated jumper on jumper
header J4 to return the EVBU to the factory configuration (single-chip mode). Jumper header J3
does not contain a cut trace short.
If J4 cut-trace short is cut, you must install a user-supplied
fabricated jumper on J4 to return it to the factory configuration.
2-6
1
J3
J4
1
Cut-Trace Short
NOTE
2
MODB
MODA
2
M68HC11EVBU/D