micro controller

What is MTK51?

MTK51 8051 Microcontroller Trainer
Build a single board computer with a 8051-compatible microcontroller, ATMEL 89S52.

MTK51 is a single board computer that uses the ATEML 89S52 microcontroller as the CPU. The board provides a 32kB RAM (code memory) for user program and a 32KB ROM for monitor program. The board is designed for studying the microcontroller hardware and instruction coding. We can enter HEX code directly to the code memory and test the code with single step running, check the result of the operation with user registers. The kit also provides more devices interfacing, e.g. ADC, EEPROM, RTC, RELAY, Programmable Port, serial ports RS232, and RS485. The MCU can run both single chip or expand modes as well.

Block Diagram of the MTK51 8051 Microcontroller Trainer.
Hardware features:
  • MCU: ATMEL 89S52 @11.0592MHz, 40-pin DIP package 8051-compatible microcontroller chips,
  • Memory: 32kB RAM, 32KB monitor ROM, 256 bytes on-chip RAM,
  • GPIO: 8255 PPI, P1, P3,
  • DISPLAY: 16x2 Text LCD,
  • Keypad: 28-key, 16-HEX key, 12-function key,
  • ADC: LTC1298, MCP3202, 2-channel 12-bit resolution,
  • RTC: DS1307 I2C interface real-time clock with +3V Lithium battery backup,
  • EEPROM: 32kB 24LC256,
  • Temperature sensor: DS1820,
  • RELAY: 10A 250VAC relay with NO-C-NC terminal,
  • Serial port: 9600 RS232 and RS485,
  • Optional keyboard: PS2 interface connector.

    The monitor software features:
  • Enter hex code directly using the 16-key hex key,
  • Single step running with user registers display,
  • Run user code full speed,
  • Display code and data memory,
  • Offset byte calculation for relative addressing mode,
  • Insert AJMP and ACALL hex code to the code memory,
  • Insert byte and delete byte,
  • Clear code memory,
  • Quick home location key.

Schematic of the MTK51 8051 Microcontroller Trainer.
Simple program demos entering the machine code and execution with single step.

The code shown below will increment the accumulator content by one. The hex code for this simple program has only 3 bytes, i.e. 04 01 00. The video shows how to enter the hex code, how to insert the AJMP instruction and how to run it with key STEP. We will see the right-hand 8-bit LED (GPIO3) counting up.
900004MAININC AA=A+1
900101 00AJMP MAINgo back main
Running full speed with forever loop program

Another sample is the forever loop running. The accumulator contents will write to GPIO3 using indirect mode through DPTR, then increment and the delay subroutine will be called. The program is repeated forever with AJMP MAIN instruction. The subroutine DELAY is simple delay code by counting two registers, R7 and R6.
900090 04 00MAINMOV DPTR,#400HDPTR=400H
900404INC AA=A+1
900701 00AJMP MAINgoback main
90097F 00DELAYMOV R7,#0
900B7E 00INNERMOV R6,#0
See the video, how to enter the hex code and run with key RUN. To end and get back to monitor program, press RESET key.

Kit information please contact: Wichit Sirichote 


Monitor program

PLD's JEDEC file
Hardware Schematic
Keypad Drawing SVG file
(4 sheets on A4 size paper) using DrawFreely Inkscape Keypad label can be made easily with sticker paper covered with the clear one.


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