JUMPERS
The CMD11E1 board is shipped from the manufacturer with the following default jumper settings:
JP1 = OFF | JP3 = ON |
JP2 = OFF | JP4 = ON |
JP10 = ON | JP5 = OFF |
JP6 = ON | JP9 = OFF |
JP7 = ON |
|
JP8 = OFF | JP13 = OFF |
Memory socket U5 is shipped with a 32K byte RAM device. U7 is shipped with an 8K byte EEPROM flash memory device. U6 is shipped with a 32K byte EEPROM flash memory device.
Also, the 68HC11 chip configuration word is set as follows:
EEON On Chip EEPROM | ENABLED |
ROMON On Chip ROM | DISABLED |
NOCOP Watchdog System | DISABLED |
NOSEC Security | DISABLED |
MODE Select Jumpers – JP1 and JP2
The MODA and MODB pins of the HC11 are pulled high by two 10k resistors. This is the normal EXPANDED MODE configuration. A shunt on JP1 will take MODA to ground. A shunt on JP2 will take MODB to ground. These two jumpers allow selection of any of the following modes of operation:
JP1 – MODA | JP2 - MODB | MODE OF OPERATION |
ON | ON | Special Bootstrap |
OFF | ON | Special Test |
ON | OFF | Normal Single Chip |
OFF | OFF | Normal Expanded (default) |
Buffalo Trace Jumper – JP13
The Buffalo Monitor Trace and Single Step functions can be enabled by installing option jumper JP13. This jumper will connect the PA3 Output Compare 5 pin to the XIRQ line for nonmaskable interrupt service for the Buffalo Trace functions. Use caution when installing this jumper that no other connections are made to the XIRQ or PA3 I/O pins of the 68HC11.
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