What's LPC2468 minimum pins for Jtag connection

cancel
Showing results for 
Search instead for 
Did you mean: 

What's LPC2468 minimum pins for Jtag connection

Jump to solution
470 Views
jun_chen
Contributor II

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.

pastedImage_1.png

    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:

pastedImage_2.png

    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

    pastedImage_3.png

pastedImage_4.png

    TDO always keep on high.

    Could you please provide application circuit for references?

Labels (1)
0 Kudos
1 Solution
288 Views
soledad
NXP Employee
NXP Employee

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


Have a great day,
Sol

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

View solution in original post

3 Replies
288 Views
soledad
NXP Employee
NXP Employee

Hi,

Below is the pins you need to connect:

pastedImage_1.png

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

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

0 Kudos
288 Views
jun_chen
Contributor II

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

0 Kudos
289 Views
soledad
NXP Employee
NXP Employee

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


Have a great day,
Sol

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

View solution in original post