P89LPC9221 FAQ

ivan_law80 · August 04, 2006, 09:48:54 PM

FAQ: P89LPC9221 Programmer Issue

Hello everybody. I am using P89LPC9221 SMD microcontroller. I have built the programmer circuit similar to MCB900 by Keil. I have measured the waveform of /RST and VDD and they appear the same as mentioned in Flash Magic 3.21 datasheet. However, flash magic always give me this error message when I try to program my P89LPC9221:

Unable to connect at the specified baudrate. Try reducing the baudrate. Reset the hardware into ISP mode again.

I have tried all the available baudrates and T1 & T2 combinations but still face the same problem.

What would be the possible errors?

Please advise. Thanks!

Regards,
Ivan

Andy Ayre · August 05, 2006, 08:12:53 AM

I already sent you some things to check via Email. Did you check them? What did you find? Do you want help via Email OR via this discussion forum?

ivan_law80 · August 06, 2006, 07:09:02 PM

Hi Andy,

I think we will discuss via this discussion forum.
I have checked my circuit. There are some differences:
In the circuit provided by Keil MCB900, can I replace the transceiver MAX563 with MAX3243? And the PNP transistor PMBTA92 with 2N4403?

Please advise. Thanks.

Regards,
Ivan

Andy Ayre · August 06, 2006, 07:14:47 PM

The MCB900 circuit is tried and tested - it is known to work. But the important thing is the waveforms. Use a scope and check the waveforms in your circuit match the ones in the application note.

ivan_law80 · August 07, 2006, 12:21:25 AM

Hi Andrew,

The waveform has some difference. I am able to get 3 reset pulse on /RST while VDD is high. However, at the starting point i am not able to get 2 pulse for both VDD and /RST.

I think I know the problem since MAX563 /EN pin will disable RXD only but for my MAX3243 /FORCEOFF will disable both TXD and RXD. Need to replace MAX3243 with MAX563.

While waiting for the missing tranceiver, i am trying to program 89LPC9221 using parallel programmer All-100 by Hi-Lo System. The programming finished successfully to program 89LPC9221-DIP20. However, my program fails to run correctly. The code of my program is as follows, please advise is there is any mistakes in my code:

START:
   CLR   EA      ;DISABLE INTERRUPT
   MOV   IEN0,#00000000B
   MOV   IEN1,#00000000B
   MOV   PCON,#00000000B
   MOV   PCONA,#00000000B
   MOV   TCON,#00000000B   ;TURN OFF ALL TIMER
   MOV     TMOD,#00100001B
   MOV   TAMOD,#00000000B
   MOV   DIVM,#00000000B
MOV   A,TRIM
   ANL   A,#10111111B
   MOV   TRIM,A
   MOV   SCON,#01010000B
   MOV   BRGR0,#00H
   MOV   BRGR1,#30H
    MOV   BRGCON,#00000011B
   MOV   IP0,#00010000B
   MOV   IP0H,#00010010B
MOV   IP1,#00000000B
   MOV   IP1H,#00000000B
   MOV   PT0AD,#00000000B
   MOV   P0M1,#11111111B
   MOV   P0M2,#11111111B
   MOV   P1M1,#11011111B
   MOV   P1M2,#11011111B
   MOV   P3M1,#00000011B
   MOV   P3M2,#00000011B
   MOV   I2CON,#01000001B
   ;MOV   RTCCON,#00000000B
   ;MOV   RTCH,#00000000B
   ;MOV   RTCL,#00000000B
   ;MOV   WDCON,#00000000B
   ;MOV   WDL,#00000000B
   ;MOV   WFEED1,#00000000B
   ;MOV   WFEED2,#00000000B
   ;MOV   KBCON,#00000000B   ;DISABLE KEYPAD INTERRUPT
   ;MOV   KBMASK,#00000000B
   ;MOV   KBPATN,#00000000B
   MOV     TH0,#0FFH
   MOV     TL0,#0F9H
   MOV   TH1,#0
   MOV   TL1,#251
   CLR   SI
   CLR   CLK
   CLR   LE
   CLR   GCLK
   MOV   A,#SLVADDR
   MOV   DEVADDR,A
   CLR   EX1
   CLR   EX0
   SETB   TR2 ;START TIMER 2
   SETB   ES ;ENABLE SERIAL ISR
   CLR   RI      ;ENABLE RECEIVER
   SETB   TR0      ;START TIMER 0
   SETB   ET0      ;ENABLE TIMER 0 OVERFLOW    SETB   TR1      ;START TIMER 1
   SETB   ET1      ;ENABLE TIMER 1 OVERFLOW    SETB   EI2C      ;ENABLE I2C ISR
   CLR   EX0    ;DISABLE EXTERNAL ISR 0
   CLR   EX1 ;DISABLE EXTERNAL ISR 1
   CLR   EKBI      ;DISABLE KEYBOARD ISR
   CLR   EC      ;DISABLE COMPARATOR ISR
   CLR   EB0 ;DISABLE BROWNOUT DETECTION
   CLR   EWDRT      ;DISABLE WATCHDOG RESET
   SETB   EA ;ENABLE INTERRUPT

STENGINE:cpl   p1.7
   cpl   p1.7
   SJMP   STENGINE
RET

erikm · August 07, 2006, 06:34:52 AM

Oh the eternal issue:

"I replace things in the programmer, why does it not work?"

one answer only: "DUH"

Erik

Andy Ayre · August 07, 2006, 08:09:24 AM

We try to keep this forum for ISP issues only, so you are probably better off posting code related questions to the forum at 8052.com.

erikm · August 07, 2006, 10:15:46 AM

so you are probably better off posting code related questions to the forum at 8052.com.

I do not think so, what you show is not 'code', but 'crap', code is commeted.

Erik

ivan_law80 · August 07, 2006, 07:25:48 PM

Hi Andy,

I have modified my circuit exactly the same with MCB900 provided by Keil website. Now I am able to program my 89LPC9221 using the following configuration:

Baud rate : 7200
Use DTR and RTS to enter ISP mode
Virgin 89LPC9221
None(ISP)
Protect ISP code

The problem is, when i try to program the second time, flash magic show this error message again:
Unable to connect at the specified baudrate. Try reducing the baudrate. Reset the hardware into ISP mode again.

Please advise. Thanks

Regards,
Ivan

frankzyb · August 07, 2006, 10:00:34 PM

Flash Download to MCB900
You can download the HEX file into on-chip Flash ROM of the P89LPC922 device on the MCB900 Evaluation Board. You need to setup the MCB900 board as described below:

Configure the Jumper Settings for FlashMagic: RUN - OFF, RESET - ON
Connect the COM Port to the PC COM1 interface using a standard 9-pin connector cable.
Connect the MCB900 Board to a power supply (5V .. 9V=, 100mA)
You have two alternatives for Flash programming: use the

ivan_law80 · August 08, 2006, 09:15:31 PM

Hi Frank,

Unfortunately, I don't have a MCB900 programmer and Keil's uVision Development Studio.

I am using PV32 by Franklin Software as my compiler and I have built a circuit same with MCB900.

I tried to program my 89LPC9221 using Flash Magic 3.21 with the following settings:

Baud rate : 7200
Use DTR and RTS to enter ISP mode
Virgin 89LPC9221
None(ISP)
Protect ISP code

The problem is, when i try to program the second time, flash magic show this error message :
Unable to connect at the specified baudrate. Try reducing the baudrate. Reset the hardware into ISP mode again.

Anybody has faced this problem before?

Please advise. Thanks

Regards,
Ivan

erikm · August 09, 2006, 07:25:53 AM

and I have built a circuit same with MCB900

99.17% of the time the answer is

EXACTLY SAME?? no component substitutions, no "i have this transistor, I'll just use it" etc

Erik

frankzyb · August 13, 2006, 08:37:20 PM

Hi Ivan,

If you have installed the KEIL uVision3,you can find the schematics of
the latest version MCB900 in this help file:
X:\Keil\C51\hlp\mcb900.chm (where :"X" stands for hard disk for the setup).

You can download a demo version uVision3 from KEIL.The Keil C51 Evaluation Kit allows you to create programs for all 8051 derivatives.

The SETUP program is on the following link:
http://www.keil.com/kdl/p3hq3symwqrpthwwzj3v31dctd/files/eval/c51v805.exe