DT206 AT89C2051 & SPI Flash Programmer
The DT206 is a programmer for the Atmel 89C2051 (a variant of the hugely
popular 8031/51 microcontroller combined with 2K of Flash memory). The 8051
family is produced by Intel, Signetics, Atmel and others. There is a huge amount
of software available for this processor.
- The DT206 is basically two programmers on the one board and was designed
to mate with the DT004 board which
connects to a Printer Port.
- It can easily be configured for AVR programming as well.
This programmer board was designed to be used with the DT004, alternative
printer port front ends can be built very easily.
SPI Flash Programmer
In the top right hand corner of the board, there is a simple SPI Programmer
using a single 74HCT126 chip. This has a 16 pin SPI programming header and a 10
pin input header. Due to the design of crimp connectors and flat ribbon cable,
the pins are double the normal count required, so that two wires on a flat
ribbon cable connect to each signal. This makes it 5 input and 8 output signals.
Input - SPI Programmer
The 5 input signals can be directly wired to a DB-25 male connector using a
10 wire flat ribbon cable and a 10 pin crimp connector. You can fit a "back
shell" to save the wires breaking off. Alternatively, you can connect the
DT206 board to a DT004 board using a pair of 30 pin right angle male and female
connectors. (see pictures).
Output - SPI Programmer
The 8 output signals match the ISP programming header on the DT103 and
boards. This can be wired up with a short 16 wire flat ribbon cable and 16 pin
crimp connector at the programmer end, and an 8 pin female header at the other.
You will need to either cut off every second wire, or solder two wires to the
one pin of the header. Heat shrink will help these wires from snapping off with
Please note *** Two signals aren't used in the cable, so it is
really only 6 connections for output.
Power - SPI Programmer
The SPI Programmer gets its power from your target board, however a link is
provided to get it from a DT004 board if required. Alternatively, you can also
power the target board from a DT004 board.
Software - SPI Programmer
My main reason for producing the ISP Flash Programmer, was to support the
AT89S8252 when used with BascomLT,
so there is already a driver for it built in to this product. BascomLT is a
great Basic Compiler at ~$49USD.
- Parts List - SPI Programmer
- 1 x DT206 PCB (both programmers on one board)
1 x 74HCT126 (E2)
2 x 1K Resistors .25 watt
2 x 5mm LEDs.
A set of 2 by 8 male header pins suitable to connect a 16 pin crimp IDC
connector and flat ribbon cable.
Suitable simple hardware to connect this cable to your target board.
J1 Header - SPI Programmer
A set of four male pins can be fitted to the J1 header position if you
choose to use the following +5V power features.
The default setting is to have the Flash Programmer get it's power from the
target board. By cutting the track on the solder side of the board from pin 3 to
pin 4, and using the pins and test links, you can power the programmer from a
DT004 board if you wish by placing a link on pins 1 and 2. You will see that
pins 2 and 3 are connected together. If you connected all pins together with two
test links, your target board can be powered from the DT004 +5V supply.
Optional - SPI Programmer
A set of 2 by 5 male header pins suitable for connecting a 10 pin crimp IDC
connector and flat ribbon cable to. This can then connect to a DB-25 male
connector with a back shell fitted.
Or alternatively, use a DT004 board as a front end.
The rest of the board is a very fundamental AT89C2051 Programmer that uses a
single 74HC174 chip and a bit of power supply switching logic.
Input - AT89C2051 Programmer
You can connect the DT206 board to a DT004 board
using a pair of 30 pin right angle male and female connectors. (You will see the
pictures when I get boards). This gives you the power supply front end and the
DB-25 input. Sure you can build your own, but the DT004 makes it very simple,
and is re-usable for other projects.
Output - AT89C2051 Programmer
A mass of pins can be daunting initially, but allows many options.
First, read hints.html and in
particular, the part on ZIF to standard sockets.
Output Method 1
This option uses two single strips of 20 pin sockets. If you can get strips
of twenty if you can get them, or cut a good quality 40 pin machine pin socket
in half (the ones that have three struts across the socket are easiest to
Solder the two strips into the socket area marked 1-20 and 21-40.
This lines up with the number 1 in the string of 1-2-3 numbers. These are at
.6" centers. Get an Aries 40 pin ZIF socket. This will push into the 2
strips you have installed. This allows you to remove the socket for other
projects (even on this board) if you wish.
Output Method 2
Solder a 20 pin Textool socket into the .3" positions marked 1-10,
11-20. Or using the methods in hints.html,
go via 2 strips of 10 pin headers so that this socket can be removed for other
projects as well.
What are positions 2 and 3??
By soldering socket strips into each location, it gives you 3 positions to
install a 40 pin Aries socket. The first position is for the AT89C2051.
The other 2 positions can be wired with 5 jumper wires from the socket strip
positions 2 or 3, to the pins on the male 30 pin header at the Simmstick bus.
These connections are then selected by moving the 40 pin Aries ZIF socket from
position to position. You can now have a Jerry
Meng, or Chris Morris
AVR programmer. The two positions will allow you to configure for two different
types of chips. This will cater for 8, 20 or 40 pin micros. No need to worry
about diodes or resistors for power as the DT004 has its own power.
This multi-position 40 pin ZIF Aries socket idea, is one that I have kicked
around for years and yet never got past the in-head design stage. If it appears
to work, I may well start laying down other Simmstick programmer designs using
the same technique. It's my belief that all DIP programmers should be based on
40 pin multi-pitch sockets such as the 40 pin Aries.
Power (for AT89C2051 Programmer)
All built into the DT004 re-usable front end.
Software for AT89C2051 Programmer:
is the software produced by Peter Averill, who also designed the circuit of the
AT89C2051 Programmer. Peter teaches Electronics at the Western Melbourne
Institute of TAFE in Australia.
For program development, BascomLT is a great Basic Compiler at ~$49USD.
- 1 x DT206 PCB (both programmers on one board)
1 x 74HC174 (E1)
R1 1 x 2K2 Resistor .25 watt (2K2 for global
engineers is 2,200 ohms)
R2 1 x 1K Resistor .25 watt See
R3 1 x 270 Resistor .25 watt See Note 1
R4 1 x 2K2 Resistor .25 watt See Note 1
R5 1 x 1K Resistor .25 watt
R6 1 x 1K Resistor .25 watt
R7 1 x 4K7 Resistor .25 watt
R8 1 x 100 Resistor .25 watt
R9 1 x 10K Resistor .25 watt
R10 1 x 100 Resistor .25 watt
The resistors R1, R2 & R3 determine the programming voltages for the
AT89C2051 Programmer, so make sure they are within the 5% standard tolerance of
common resistors. 1% resistors could be selected if they are readily available,
but not required. Just make sure yours are as close to the value as possible and
within that 5% mark.
C1 1 x 0.1uf Ceramic (Bypass cap. Code 104)
C2 1 x 0.1uf Ceramic (Bypass cap. Code 104)
C3 1 x 0.1uf Ceramic (Bypass cap. Code 104)
C4 1 x 1nf Ceramic
(.001uf Code 102)
LM317T Adjustable regulator in a TO-220 Case.
- These are generally cheaper and more readily available compared to the
small TO-92 case variety, to say nothing of the current ratings.
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 as shown. This means the flat side of
transistors Q1 and Q2 will both be facing towards the LM317T regulator. It also
means you will have to bend the center leg slightly in the opposite direction.
US types are:
Q1 2N3904 NPN Transistor
Q2 2N4403 (2N3906) PNP Transistor
Recommended Position 1 ZIF socket configuration:
- 2 x strips of 20 pin machine pin sockets.
1 x Aries 40 pin ZIF socket.