Motorola CMD11E1 - Manual (Page 10)

10
JUMPERS
The CMD11E1 board is shipped from the manufacturer with the following default jumper settings:
JP1 = OFF JP3 = ON JP6 = ON JP9 = OFF
JP2 = OFF JP4 = ON JP7 = ON
JP10 = ON JP5 = OFF 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.