18
Programming Jumpers
Programming the CME11E9-EVBU external EEPROM memory is performed by installing
MODA and MODB jumpers and the WRITE_EN jumper. The utility software provided can
be used to program the EEPROM. See the
Tutorial
section in this manual for more
information.
After programming, remove the WRITE_EN jumper before applying RESET or removing
power from the board to guarantee retention of the new program.
TRACE / PROG Jumper
The Buffalo Monitor Trace and Single Step functions can be enabled by installing the
TRACE jumper (position 2-3 of the 3 position jumper). Use caution when installing this
jumper that no other connections are made to the XIRQ or Port A3 I/O pins of the
68HC11E9.
The PROG position (1-2) will connect VPP+ to the XIRQ port line for programming the
internal EPROM of a 68HC711 device installed in U1.
CAUTION
should be used so that the
PROG jumper is only installed (and VPP applied) during this programming operation.
SYNC Jumper
This jumper changes the timing of the peripheral chip selects C0-7. When open (default) the
chip selects will be active for the whole bus cycle to the connected peripheral. This position
provides chip select setup and hold time required by some peripheral devices.
If this jumper is installed, the chip selects will be valid whenever data on the data bus is
valid. This allows simple latches to operate from a chip select to add input and output lines.
MEM-EN Jumper
This jumper is not available on all boards.
It should be installed for Expanded Mode operation and for programming the external
memory devices. The jumper should be removed for true Single-Chip Mode operation to
prevent memory data bus conflicts with Port C if the Port C strobes are used.
