Standard ISP Header

A discussion on [Software Akuntansi Laporan Keuangan Terbaik] the LPC2000 Yahoo group about the In System Programming facility on Philips chips led to the idea of choosing a common standard for a header to interface with the chip for programming. [4shared] [gemscool] [mivo tv] [fb facebook] [kata kata mutiara] [lagu indonesia terbaru] [kata kata bijak] [youtube] [waptrik] [harga blackberry] The ISP function requires 3.3v logic levels for serial transmit, receive, reset (active low), and the P0.14 line that enables the boot loader when held low for a few ms after a reset.

This can be wired up to a PC RS232 port, with appropriate level shifting. For those who don't want to include an RS232/line driver in their board, it makes sense to have a little header where one can plug in a small adapter that has the line drivers for connection to a PC.

We've tentatively (after much discussion) agreed upon using a 0.1" male header of 8 pins in two rows, with the following layout (when viewed from above):

1	3.3V	/RST	2
3	/ISP	RxD	4
5	0v	TxD	6
7	n/c	key	8

The 'key' is a missing pin on the header - and a corresponding filled in hole in the female plug, to make sure one cannot insert it wrongly and unleash the magic smoke from within one's circuit.

Notes:

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• All at 3.3v logic levels
• /ISP is P0.14 on the LPC21xx chips
• The board with the uC on is expected to have pull ups on /ISP and /RST so the thing will work fine without anything plugged into the header
• The 3.3v and 0v lines are supplied by the uC board, and are intended for powering the RS232 line drivers.
• RxD is receive from the perspective of the uC device - the programmer should drive this line, and the uC should drive the TxD line.

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An adapter that conforms to this interface and provides a link to a PC's serial port is available from Aeolus Development http://www.aeolusdevelopment.com/Articles/InSystemProgramming.html Also has interface schematics for Philips LPC2104/5/6, LPC2119/29 and Analog Devices ADuC7020/21. [kata mutiara] [kata bijak] ___Salam kenal New Bie___izinkan untuk sukses di GT Radial

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