Author Topic: FM RST to 'U char delay  (Read 4293 times)

Je Gold

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FM RST to 'U char delay
« on: February 03, 2007, 01:31:00 pm »
Hi Andy,

Unable to start the boot loader of P89v51RD2

I have the following setup

FM Version  ver  3.43.183   8051/XA Driver Version 2.26.181,  Serial 9600Bd, COM1
P89V51RD2  (new, vergin chip)
11.0592MHz Xtal (oscillating - check by CRO)
RST circuit using  74HC125 as per application notes
ALE /PROG - 33k pullup
/PSEN - 33k pullup
/EA = Vdd


DTR -- RST T1  = 50mS
RST -- Not used

Using a CRO  I measured

a.  DTR -- RST correct  ~ 50mS

b. Delay between deaserted RST  and  'U' transmission  400mS

Comment
It would seem the b. delay is too long and not setable in FM.

OTHER TEST
In terminal mode - if I hold down the 'U' char  theb POR   - 'U' characters start to echo from from the P89v51R2 confirming entry in to bootloader mode and TxD working.


Are there any other options I should set to reduce the delay between RST to 'U' transmision?  OR does FM need and update?

Joe   :D
« Last Edit: February 03, 2007, 01:48:44 pm by Je Gold »

Je Gold

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Re: FM RST to 'U char delay
« Reply #1 on: February 03, 2007, 01:43:51 pm »
Hi Andy ,

I Changed  Xtal to 3.579MHz.... (and  baud rate  9600Bd)..... so the 400mS delay in FM would be less crictical.

It works.... I can activate the bootloader and read the device type etc.

So it would seem the time delay (b. in my previous post) is a little too long in Flashmagic.

Regards
Joe  :)
« Last Edit: February 03, 2007, 01:47:43 pm by Je Gold »

Andy Ayre

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Re: FM RST to 'U char delay
« Reply #2 on: February 05, 2007, 01:37:24 pm »
Thanks. I have another report of this problem from phonoplug and I will look into it shortly.

Andy
Embedded Systems Academy, Inc.
support at esacademy dot com

Andy Ayre

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Re: FM RST to 'U char delay
« Reply #3 on: February 09, 2007, 03:02:56 pm »
This was broken in version 3.39, but is fixed in version 3.46 - just uploaded. Thanks for letting me know!

Andy
Embedded Systems Academy, Inc.
support at esacademy dot com