topic What's LPC2468 minimum pins for Jtag connection in LPC Microcontrollers

What's LPC2468 minimum pins for Jtag connection

jun_chen — Wed, 10 Jul 2019 10:38:41 GMT

Hi,

I am working on LPC2468, trying to program data through ISP and IAP.

Below is the circuit diagram of my work, just want to know minimum pin require, so I only connect necessary pins.

ISP program through UART protocol is working great, but the speed is too slow.

So I decide to connect LPC2468 to JLINK, program it through Jtag protocol(J-Flash 6.44V), But TDO pin didn't return any response.

Pin connection:

Jtag -> PC2468

nTRST -> TRST

TDI -> TDI

TMS -> TMS

TCK -> TCK

RTCK not connected

TDO -> TDO

RESET -> RESET

DEGRQ not connected

5V-Supply -> VCC

GND -> GND

TDO always keep on high.

Could you please provide application circuit for references?

Re: What's LPC2468 minimum pins for Jtag connection

soledad — Thu, 11 Jul 2019 17:23:48 GMT

Hi,

Below is the pins you need to connect:

The JTAG port may be used either for debug or for boundary scan. The state of the DBGEN pin determines which function is available. When DBGEN = 0, the JTAG port may be used for boundary scan. When DBGEN = 1, the JTAG port may be used for debug.

Have a great day,
Sol

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Re: What's LPC2468 minimum pins for Jtag connection

jun_chen — Fri, 12 Jul 2019 01:59:35 GMT

Do I need to worry about EINT0 or other pins, when I trying to connect IC with Jtag?

Re: What's LPC2468 minimum pins for Jtag connection

soledad — Fri, 12 Jul 2019 15:58:40 GMT

No, you don't need to worry for EINT0 or other pins.

Have a great day,
Sol

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