download use jlink issue

[caibai]

Keil MDK : 5.23

CHIP : LPC824M201

Jlink dirver: V5.12f

i configure CRP as NO_ISP mode

; <h> Code Read Protection
;   <o> Code Read Protection  <0xFFFFFFFF=>CRP Disabled
;                             <0x12345678=>CRP Level 1
;                             <0x87654321=>CRP Level 2
;                             <0x43218765=>CRP Level 3 (ARE YOU SURE?)
;                             <0x4E697370=>NO ISP (ARE YOU SURE?)
; </h>
                IF      :LNOT::DEF:NO_CRP
                AREA    |.ARM.__at_0x02FC|, CODE, READONLY
                DCD     0x4E697370
                ENDIF

                AREA    |.text|, CODE, READONLY

i download with jlink several times then it said that

jink log as follow

how to recovery chip？

[jeremyzhou]

Hi,

Thank you for your interest in NXP Semiconductor products and 

for the opportunity to serve you.

I've attached a guide about recovering the LPC MCU, please refer to it for details.

Hope this helps.

Have a great day,
TIC

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[caibai]

thank you for reply,

but i can't connect device by jlink and error message is

***Jlink Error: DAP error while reading AHB-AP IDR.

[jeremyzhou]

Hi cai bai,

Thanks for your reply.

I'd like to know whether the LPC824 can enter the ISP mode or ISP.

If yes, Flash Magic tool supports erase feature which can recover the chip.

Please give it a try.

Have a great day,
TIC

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

[caibai]

LPC824 can't enter ISP, it can't be use Flash Magic to connect deivce,

now i disable CRC (set value to 0xFFFFFFFF at 0x000002FC) but it also can't to connect after first download image to flash.

[jeremyzhou]

Hi cai bai,

In my opinion, the MCU definitely is able to enter ISP mode unless the CRP protection be enabled.

So I'd highly recommend you to check the code whether may override the original value of the 0x000002fc.

Have a great day,
TIC

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

[caibai]

thank you for reply, now i can goto ISP mode and download success,but when i check nReset Pin, the voltage only 2.0V,some times  only 1.0V, MCU input voltage is 3.0V?