Development System for 80c517a

For all my projects where I have used the microprocessor, the choice has always been directed to the mythic 6502. This due to several reasons as: availability, no expenses (for me at least) and a relative facility to program it. The only problem is that a microprocessor needs a chips (6522) to have I/O available together with some logical ports + RAM and EPROM, therefore a very big printed circuit board and furthemore the 6502 does not have specific instructions to manage the bits and this makes the work on the port quite uncomfortable. Therefore, since I have decided to build my new HF transceiver, the idea to change to a microcontroller has been finally defined. It has not been an easy decision considering that for several weeks I have studied data sheets and navigated trough Internet in order to understand which could have been the best choice for the cost and the chip power and availability. At the end the candidate was this :

80C517A SIEMENS.

I summarize shortly some caractheristics of the 80C517A for those who do not know it:

• SAB 80C517A/83C517A-5, up to 18 MHz operation frequency
• 32 K x 8 ROM (SAB 83C517A-5 only, ROM Protection available)
• 256 x 8 on-chip RAM
• 2K x 8 on-chip RAM (XRAM)
• Superset of SAB 80C51 architecture:
• - 1 uS instruction cycle time at 12 MHz
• - 666 nS instruction cycle time at 18 MHz
• - 256 directly addressable bits
• - Boolean processor
• - 64 Kbyte external data and program memory addressing
• Four 16 bit timer/counters
• Powerful 16 bit compare/capture unit (CCU) with up to 21 high-speed or PWM output channels and 5 capture inputs
• Versatile "fail-safe" provisions
• Fast 32 bit division, 16 bit multiplication, 32 bit normalize and shift by peripheral MUL/DIV unit (MDU)
• Eight data pointers for external memory addressing
• Seventeen interrupt vectors, four priority levels selectable
• genuine 10 bit A/D converter with 12 multiplexed inputs
• Two full duplex serial interfaces with programmable Baudrate-Generators
• Fully upward compatible with SAB 80C515, SAB 80C517, SAB 80C515A
• Extended power saving modes
• Fast Power-On Reset
• Nine ports : 56 I/O lines, 12 input lines
• Plastic packages : PLCC-84 / P-MQFP-100-2

Functional Block Diagram

Therefore, choosed the micro, I had look for a development system at least. Due to the fact that I had not enough time to write the software by myself and considering that the development systems are not within my capabilities (!), I asked Internet for a solution.Basically, on my circuit I have foreseen to use ELMER published on QEX n. 12/96 da Anthony L. Marchese N2YM and DEVICE 51 available on site http://home.t-online.de/home/salm.software .

• ELMER needs an outer assembler ( I use TASM x DOS available on :http://www.halcyon.com/squakvly/tasmsum.htm ) and a communication program through the serial port ( I use Window's Terminal). The software (Monitor) to put into Eprom is available at : http://www.arrl.org/qexfiles/mar8051.zip Permits to read or modify the registers, inner and outer RAM and the port ; break-point can be inserted but it is not possible to carry out the program step by step. The autor gives the source code as well.

• DEVICE 51 being for Windows and having already integrated the compiler, is better than the previous one but is a shareware product.It allows all operations of the ELMER and furthermore to carry out the program step by step.

The schematic diagram is classic. Includes RAM 8 K (6264), EPROM 8 K (2764), the usual latch HC573 and the MAX 232 for serial port. Although two ports (P0 e P2) are used for DATA + ADDRESS, there always remain a lot of lines available, enough for the most part of applications. . The 80c517a includes also the A/D converter 10 bit with 12 multiplexed inputs.

Click here to downlod the PCB file (40 K)

Click here to download the schematic file (15 K)

The diagram and the PCB have been drawn using CIRCAD that I consider one of the best programms to drawn printed circuits. Furthemore, it is possible to use the demo version that functions perfectly apart for the output Gerber's file and other exportation format. I print directly on shine sheet using an EPSON STYLUS COLOR and the result is perfect. CIRCAD is available at website http://www.holophase.com

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