- Wed Apr 06, 2011 2:37 pm
#124735
Hi, I have a custom board where I am using a LPC2136.
I am using a JTAG J-link to program the board and it works great, however as soon as I try to run the programmed code by applying power to the board without the debugger attached nothing happens. If I disconnect the debugger while the board is running it continues to operate correctly. I am using the following configuration:
RTCK is pulled down in order to enable the JTAG
P0.14 is pulled up in order to disable the bootloader
P0.31 is pulled up to prevent the mcu in disabling the JTAG port upon reset
The RESET pin is connected to JTAG (with pullup) and to a voltage monitor through an AND gate.
The clock is provided by an external 20MHz crystal.
I would greatly appreciate any ideas or suggestions!
Best regards
DeniTCH
I am using a JTAG J-link to program the board and it works great, however as soon as I try to run the programmed code by applying power to the board without the debugger attached nothing happens. If I disconnect the debugger while the board is running it continues to operate correctly. I am using the following configuration:
RTCK is pulled down in order to enable the JTAG
P0.14 is pulled up in order to disable the bootloader
P0.31 is pulled up to prevent the mcu in disabling the JTAG port upon reset
The RESET pin is connected to JTAG (with pullup) and to a voltage monitor through an AND gate.
The clock is provided by an external 20MHz crystal.
I would greatly appreciate any ideas or suggestions!
Best regards
DeniTCH