Motorola MC68705P3 ( 68705P3 ) eprom reader / copier / programmer

Note: Reading operates at 4 Mhz Speed (Switch I2 in Position 0) in order to divide by 4 the read-out.
If one 68705P3 append to be hard to read then operates at 1Mhz Speed.
The extraction of the program is done by consecutive verifications : This task that can take up to 3 days is very reduced howing to a powerful algorithm.
Depending on the memory used in the microcontroller, it can takes from few hours to a dozen of hours.

MC68705P3S reader tool:

The diagram is given here : 68705p3.pdf (49 Kb)
operating manual (french) is given in the file 68705-p3.zip (307Kb)
The microcontroller "1"MC68705P3 must be programmed with the content 68705-1.bin (2Kb) the listing of the program disassembled is given in the file 68705-1.src (47Kb).
The little MS-DOS Software lect-p3 that allow transfering the content of the SRAM 6116 to the P.C. is :
lect-p3.zip (50Ko)

The SRAM 6116 can be replaced by the M48Z02 (or MK48Z02) Zeropowerram from ST , so that it can be read by a universal devices programmer.

The software lect-p3 can also work under WIN98.

This tool is a dedicated reader / copier tool that allow to read out the MC68705P3 mcu.
It is a standalone tool.
Some leds indicates the state of operation.

notice 68705-3.txt

notice 68705-5.txt

STANDALONE OPERATION:
READING OF THE MC68705P3:
Put Switch I5 on Position AUTO (0)
Put Switch I2 on position 4 Mhz (0)
Plug the power
Put the 68705P3 containing the program to read in the Socket "2"
Put Switch I3 on position 12 Volts (0)
Put Switch I1 on position 5 Volts Operation (1) : Led L1 lights on
Put Switch I4 on Position Lect/Prog (1)
Press the key BP during a second then Led Led blinks every half seconds and led L4 blinks very quickly. Reading is starting , extrcating the program in the SRAM.
At the end of the reading Led L2 L3 stay lit but L4 is lit off
Put I4 switch in position Stop (0)
Put I1 in position Stop (0) Led L1, L2, L3 light off
Put away the MC68705P3 that has been read.

Fix the empty device on socket 2
Put switch I2 on position 1MHZ (1)
Put Switch I3 on Position 25Volts (1)
Put switch I1 on Position Operation 5Volts (1) : Led L1 light on.
Put Switch I4 on position lect/Prog (1)
Put Switch I5 on Position Prog (1) : Led L4 blinks every 5 seconds approx. and indicates that programming is in progress during 1mn 30s approx.

At the end of the programming, the led L3 lights on In the case the programm has been transfered all right, Led L2 should light on 1 second after and indicates the verification is OK Led L4 stops blinking.
Put Switch I5 on position Auto (0) : Led L2 & L3 light off
Put I4 on position Stop (0)
Put I1 on Position Stop (0) : Led L1 lights of Remove the programmed 68705P3.

Power Supply : the power supply is done by a 5VA Transformer with 2 voltages 24 Volts and 9 Volts : the power does not exceed 5 Watts approx.

DB25 -
(2) TX
(3) RX
(7) GND + Connect (4) & (5) each other ; Connect Also (6) , (8) & 20 each other. this allow the software to recognise if the programmer is plugged or not.

Transformer 5VA 2 outputs : 24 Volts and 9 Volts
Regulator 5 Volts L7805CV
Fuse 1.5A 250V and Fuse socket
Programmed MC68705P3(1)
2 x 28 pin Sockets , 1 x24 pin Socket ZIF Socket Optionnal
1 SRAM 6116 or ZEROPOWER RAM M48Z02-70PC1 (contains lithium cell 10 years) that can be read by a universal programmer.
CMOS ICs : 4040 x2, 4011 x1
5 SWITCHES ON-OFF 3 connexions
Transistors T2,T3,T4 : BC546
Transistor T1: 2N2907A
L1, L3, L5, L6 3mm Red Led
L2, L4 3mm Green Led
DZ2 BZX85C10 Zener
DZ1, DZ3 BZX85C12 Zener
1N4004 x 8 , 1N4148 x8
R33 :100 OHMS
R4, R5, R28 : 330 OHMS
R29, R30 470 OHMS
R9 : 820 OHMS
R3, R34 : 1KOHM
R10 TO R19, R19 - 21 TO 26 631 - 32 4K7OHMS
R2 10KOHMS
R1- R8- R27 22KOHMS
R7 : 27KOHMS
R20 : 100KOHMS
R6: 330KOHMS
C1-C4-C8-C9-C11 100 NF
C3 2.2µF/POL
C2-C5-C10 10µF/POL
C6 100µF/POL
C7 470µF/POL

No PCB is available at the moment : I advise you to use the Wire-Wrap method or wire method.

If you look forward for other information about this MC68705P3 Reader, do not hesitate to contact me by e-mail at: matthieu.benoit@free.fr .

Si vous recherchez des informations pour ce lecteur de MC68705P3, vous pouvez me contacter par e-mail : matthieu.benoit@free.fr . De même si vous avez des informations sur ce programmateur, n'hésitez pas à contribuer à cette page.