Simple programmer. Scheme, description

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Simple programmer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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The programmer is a device made on a printed circuit board and connected via a parallel port to an IBM PC type computer. Programming is carried out by a special control program. The program is implemented as an application for WIN95WIN98.

The programmer can write the following types of microcircuits:

27C16(К573РФ5), 27C32, 27C64(К573РФ4), 27C128, 27C256(К573РФ8), 27C512.

Adjustment to the type of microcircuit is carried out by switches located on the programmer, as well as in the program.

Program description

The program is written in DELPHI3. Writing and reading LPT registers are written using assembler inserts, so the program will not work under WINNT and WIN2000. The necessary time intervals for the establishment and retention of the gates are set by performing a certain number of empty cycles.

Below is the appearance of the control program.

Simple programmer. Appearance of the control program
Rice. 1. Appearance of the control program

The file to be written to the ROM must be in a ready-made binary format. Recording starts at the address set in the Start Address field and ends either at the end of the file or when the address value exceeds the value set in the End Address field.

Programming order

1. Run the control program;

2. Select the type of microcircuit in the program from the list;

3. Select a file to write to ROM;

4. Set the switches on the board in accordance with the type of microcircuit;

5. Install a writable chip;

6. Apply power supply and programming voltage to the programmer;

7. Record.

Description of the device.

Schematic diagram of the programmer

The programmer is controlled through the LPT port, which consists of three registers:

Data register. D_LPT0-D_LPT7. Data is transferred through this register;

control register. -STROBE, -AUTOFD, -INIT, -SLCTIN. Signals in this register control data transfer;

input register. Through the input register, data is received from the ROM. Four bits of this register are used for reception - ERROR, SLCT, PE, -ACK.

DD1, DD2 (555IR22) - address registers

Registers DD1, DD2 are designed to set the address of the ROM. DD1 sets the least significant bits of the address, DD2 - the most significant ones. Writing to these registers occurs through the LPT data bus on the rising edge of the control strobes -AUTOFD and -INIT, respectively.

DD3 (555IR22) - register of control signals

The DD3 register is designed to generate strobes that control the operation of the ROM and the data bus (see table).

Address	Name	Strobe function
0	Not used	-
1	Not used	-
2	-PGM	Write to ROM
3	OUT	Connecting DD5 to ROM
4	-CS_ROM	Write to ROM or select a crystal
5	-OE_ROM	Setting the ROM to write / read data
6	INLOW_STR	Connecting DD4.1 to LPT
7	INHIGH_STR	Connecting DD4.2 to LPT

The control word is written to the register via the LPT data bus on the rising edge of the -SLCTIN control strobe.

DD4 (555AP5) - receive buffer

DD4 - two 4-bit buffers through which data is received from the ROM to the IBM PC. One accepts the low 4 bits of data, the other - the high ones. This division is made due to the fact that the LPT has only 5 input lines. Buffers are connected to LPT inputs by strobes inlow_str and inhigh_str of the control register DD3 (see table).

inlow_str	inhigh_str	LPT
0	0	Forbidden state
0	1	D0-D3
1	0	D4-D7
1	1	Undefined

DD5 (555IR22) - data register for writing

DD5 - 8-bit data register. This register sets the data to be written to the ROM. Data is written to it via the LPT data bus on the rising edge of the -STROBE control signal. The state of the output signals of this register depends on the strobe OUT of the control register DD3. When OUT=0, the data from the register is output to the ROM data bus, when OUT=1, the register outputs are in a high-resistance state.

Device design

There are two slots for installing chips on the programmer. One for ROM chips, the other for MK51 microcontrollers (the programming of microcontrollers has not been fully worked out, therefore this type of microcircuits is not in the control program). Ordinary DIP panels were used as landing pads.

The supply and programming voltages are connected to connector P2. The programming voltage should be set according to the technical requirements for each type of microcircuit.

Warning: Since the setting for the type of chips is carried out by switches, the device can be turned on only after installing the chip and setting the switches accordingly.

You can download the following files related to the project:
prog_sch.zip - electrical circuit archive in ACCEL P-CAD V15 format
prog_pcb.zip - PCB drawing archive in ACCEL P-CAD V15 format

Author: Sergey Rostovtsev, rmsergey@chuvashia.ru; Publication: cxem.net

See other articles Section Microcontrollers.

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