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Dontronics - Frequently Asked Questions - Micro and Electronic
Specific FAQ's
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Frequently
Asked Questions
Micro
or Electronics Specific Questions
What
is the difference between the PIC16C84 and the PIC16F84, and do you have
the C84?
Can
you help me get the source code out of a code protected Microcontroller?
Transistor
Types. US Equivalents?
Do
you have specs on the LCD displays you sell?
Introduction
to Micros for Beginners: http://www.dontronics.com/xcart/newbies.html
Cheapest
method to get started in Micros: http://www.dontronics.com/dt006.html
Information
for joining PIC and AVR groups, and News Groups: http://www.dontronics.com/chat.html
Dontronics
new Message Board is up and running: http://www.websitetoolbox.com/tool/mb/dontronics
Motorola's
got a decent 332 page book about microcontroller fundamentals. You can
download it for free from http://e-www.motorola.com/files/microcontrollers/doc/ref_manual/M68HC05TB.pdf
but be warned that it's almost 2MB in size.
also
at: http://www.freescale.com/files/microcontrollers/doc/ref_manual/M68HC05TB.pdf
We
hope this helps you to get to the point where it all "clicks".
Or
visit an Electronics or Micro related News Group.
Don't
know what a News Group is?
http://groups.google.com/googlegroups/deja_announcement.html
news:aus.electronics
news:comp.robotics.misc
news:comp.arch.embedded
Questions
that have very little to do with Dontronics, or what we sell.
http://www.google.com/
and type in your question.
Or
visit an Electronics or Micro related News Group.
Other
FAQ's:
Ordering
and Payment Questions
Shipping
Information
Web-downloaded
Software
General
Questions
Micro
or Electronics Specific Questions
What
is the difference between the PIC16C84 and the PIC16F84, and do you have
the C84?
The
PIC16F84 (68 file registers or ram bytes) is upwards compatible with PIC16C84
(36 reg), except for the polarity of the power-on timer enable bit, and
code protection bits. Neither are very important for a hobby project. Using
the appropriate header files (in whatever language you use) will usually
take care of these differences, but in a pinch you can simply substitute
a 16F84 for a 16C84, invert the power-on enable (if you care at all) and
live with a less-than-perfect code protection (if you enabled this at all).
We haven't stocked a C84 for years. They are obsolete - you can't get
them now.
Can
you help me get the source code out of a code protected Microcontroller?
The
chip manufacturers provide a means of code protecting their micros so that
these can't be read. When the chip is programmed, the code protect
bit(s) are set so that programmers can't read the code back. We can't
assist you. This is done to protect Authors, and stop piracy.
You may have a legitimate reason to get the code, and we have heard of
code busting methods on the web, but if this is the case, use your search
engine, we can not help.
Transistor
Types
Q1
BC548 (BC547) NPN Transistor
Q2
BC558 (BC557) PNP Transistor
US
Transistor types can be used, but you will need to position the devices
at 180 degrees to the overlay. This means you will have to bend the
centre leg slightly in the opposite direction.
US
types are:
Q1
2N3904 NPN Transistor
Q2
2N4403 (2N3906) PNP Transistor
Do
you have specs on the LCD displays you sell?
These
HD44780 types of displays are very common, and there are many sources of
information all over the web about them.
How
to control a HD44780-based Character-LCD
http://home.iae.nl/users/pouweha/lcd/lcd.shtml
http://ee.cleversoul.com/lcd_project.html
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