MDE 8051 Trainer with Maxim DS89C4XX

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Part Number:DIG-0010-NKC

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IC	Maxim DS89C4XX
Connectors	Two full-duplex serial ports. All ports accessible via male & female headers
Programming	In-system programmable via serial port

Serially programmable (using PC HyperTerminal, no need for external EPROM burner)
Dual serial ports
Integrated digital I/O (8 switches and 8 LEDs)
All ports accessible via male & female connectors
Onboard power supply
Connects to serial ports of PC
DS89C4XX Features:
- 8051 Pin- and Instruction-Set Compatible
- Four Bidirectional I/O Ports
- Three 16-Bit Timer Counters>
- 256 Bytes scratchpad RAM
  - On-Chip Memory
  - 16KB-64KB Flash Memory
  - In-system programmable via Serial Port
  - 1KB SRAM for MOVX
- ROMSIZE Feature
  - Selects Internal Program Memory Size from 0 to 16K
  - Allows Access to Entire External Memory Map
- High-Speed Architecture
  - 1 clock-per machine cycle
  - DC to 33 MHz operation
- Two full-duplex serial ports
- Programmable watchdog timer
The MDE 8051 trainer board is a powerful single-board microcontroller trainer based on the Maxim DS89C4XX. The kit includes:
- The 8051 Trainer board
- Power supply
- Serial cable
- Wire kit w/ ten 6" jumper wires
The 8051 trainer is designed to accompany the textbook
"The 8051 Microcontroller and Embedded Systems"
by Muhammad Ali Mazidi, Janice Gillespie Mazidi, and Rolin D. McKinlay.

To learn how to test and program your 8051 trainer, please visit: the MicroDigitalEd website.

Owner/Operator of SWORD Electronics LLC

The Quality is really first rate. I am waiting on a C Compiler to come in. My business is booming and I have little time to try out new things too often.

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Reviewed by: John W Lynch from 743 NW Lynch Road Apache, Oklahoma USA. on 11/11/2013

Q: MDE 8051 : DS89C4XX? XX? What chip does it come with? a DS89C420, DS89C430, DS89C450?

Asked by: Tom - 4/4/2015

A: The kit includes the DS89C450 micro controller.

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Answer provided by: Administrator (6/16/2015)

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Q: I just bought one of these from you yesterday:and I have been reading up on the DS89C450, so my question is since it is rated as capable of 33 MHz, if I were to change out the crystal would the board still work correctly @33 MHz or a little less?

Asked by: Daniel Graves - 10/26/2013

A: I would not do that because the thermal effect of such high freq. Also such a high freq might not be compatible with the 9600 baud rate needed for downloading the program into the chip.

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Answer provided by: Administrator (11/5/2013)

A: Not sure what Administrator means by "thermal effect".
Daniel- You should have no problem with running a different xtal, up to 50MHz I beleive the part is spec'd for. The serial loading program uses an auto-baudrate detect, so it incorrect to say it must use 9600 baud for programming. If this is similar to Atmels serial loading, the software sends an upper case "U" to the micro (55h or alternating 1s/0s); the micro detects the baudrate from these 10 clock pulses (including start/stop bits) sets its internal baudrate generator to the same speed and replies with "U". Baud rate for your application would of course depend on the settings of the SFRs and timers or baudrate generator you choose to implement.

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Answer provided by: Pyramid (12/31/2013)

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Q: Can the 8051 be programmed wirelessly?

Asked by: tony stewart - 10/15/2013

A: The training board can be programmed by RS232. If you can add an xbee, bluetooth or another 2 way radio transmission that can convert at the end to RS232, then the board can be wirelessly programmed. As shipped, the board requires an RS232 interface.

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Answer provided by: Admin from ipad (10/15/2013)

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