program p89LPC920 using MCB900

Started by doru, May 25, 2007, 02:01:56 AM

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doru

Hi,
I have recently bought a MCB900 (vers.4). I never used the ISP
programming until now.
I succeeded to program PLCC28 microcontrollers, by plugging the LPC
into PLCC28 socket.
I have tryed to program other LPCs with ISP capabilities (having 20
pins), in TSSOP or DIL case.
I removed the PLCC28 microcontroller from MCB900 board;
I connected the P89LPC932's ISP lines of the MCB900 board, through a 5
wires cable, to a P89LPC920 in TSSOP20 case, from an external board
(P89LPC920 was soldered on the board):
(VDD,GND,RESET,RXD,and TXD) from the P89LPC932 socket to
(VDD,GND,RESET,RXD,and TXD) from the P89LPC920 board..
I respected the jumpers' positions Run-off, RST-on on MCB900 board, but
I couldn't program with Flash Magic the microcontroller from this new
board.
Could anybody help me...?
Thank you very much!

Doru

Je Gold

How long are the wires?  Are they short as possible?

You may need a decoupling capacitors across VDD and GND on the LPC920 board.

Is the LPC920 in a product or just a target board with only the 5 wires?
(there may be other things interfering with RESET TxD and RxD).

If you have a oscilloscope  - monitor the VDD for noise and correct 3v3 voltage during programming.

Joe