NimbleSig III ISP Mode Push Button Re-Start Modification
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For those that wish an alternative to the pull-down probe for starting the LPC2138 MPU in ISP mode
a single SIP pin jack can be connected to the port 0.14 pin with a small jumper and then hot glued to the top of the
LPC2138 package. A small cable assembly cable can be made up with a 10 pin SIP plug that will plug into the JTAG receptacle
and a single pin SIP plug that plugs into the SIP jack to apply ground to the I/O port 0.14 pin. A pushbutton switch is provided to
re-start the LPC2138 in ISP mode. The schematic for this rather simple, but somewhat tedious to install, modification is shown
below. The mod provides a straight forward method for re-starting the LPC2138 in ISP mode thus it may be worthwhile for
those that wish to establish an easy way to load possible future firmware updates.