programovanie AT89C51RE2

[Martin Persich]

Sice jsem ted trosku chytil zmatek v tech jednotlivych typech, nicmene pro
AT89C51RD2 (kterou pouzivame) plati zajimavy odstavec z datasheetu (a
predpokladam, ze mozna i pro jine typy):
-------------
The Hardware conditions (EA = 1, PSEN = 0) during the Reset# falling edge
force the
on-chip bootloader execution. This allows an application to be built that
will normally
execute the end user's code but can be manually forced into default ISP
operation.
As PSEN is a an output port in normal operating mode after reset, user
application
should take care to release PSEN after falling edge of reset signal. The
hardware conditions
are sampled at reset signal falling edge, thus they can be released at any
time
when reset input is low.
-------------
jinymi slovy - dosli jsme k zaveru a prakticke poznatky to potvrzuji -
signal PSEN je potreba uvolnit po sestupne hrane signalu RESET, jeste pred
aktivaci FLIPu. Kolega dal dohromady jednoduchy udelator s nejakym CMOS MKO,
ktery to ma na starosti. Bez tohoto udelatoru se obvykle tak 1 obvod z 10-ti
kusu neda naprogarmovat.
Jo - Atmel ....
Martin. persich@transcon.cz


----- Original Message ----- 
From: "j s" <jarin.hw@gmail.com>
To: "HW-news" <hw-list@list.hw.cz>
Sent: Tuesday, October 06, 2009 3:49 PM
Subject: Re: programovanie AT89C51RE2


Dakujem za odpoved.
Ta RD2 je uplne panensky kusok, cerstvo privezeny od Farnella.
Predpokladam, ze takyto kusok by mal mat bootloader "od vyroby", ci sa
mylim?

J.S.


2009/10/6 Radek Benedikt <benedikt@login.cz>:
> RD2 ma bootloader v hlavni flash, ED2ka ho ma "zadratovan". V RD2ce se da
> zmenit, prepsat, smazat,... Nastaveni HW pinu pro ISP programovani znamena
> jen to, ze procesor nestartuje od 0x0000 ale skace na vstupni bod loaderu.
> Když tam loader není, tak není co pustit. ISP loader se sice prepsani
brani,
> ale přes paralelni programator ci vlastní SW jde vse.
>
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