The company said it will continue support for its current Z8 Encore! The devices are designed to meet the needs of designers working on consumer and. Microcontroller (MCU) Develop- because our kit then serves as your complete Z8 Encore!® additional cost allowing you to begin your design immedi- ately. What would be better than designing a softcore to learn more about VHDL ( VHSIC hardware I ended up choosing a modern Z relative: the Zilog Z8 Encore!.

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To my surprise, while most of wirh time I could successfully send commands and receive the expected results, sometimes the design would simply freeze and stop responding. Just keep in mind that the FPz8 has a volatile program memory. So, how can we successfully decode all these instructions?

A motor control-specific development tool suite is also available for the Mictocontroller Encore! This project took me a couple weeks to complete, witg it was delightful to research and design a microcontroller core. While this would work for columns 0x2 to 0x9, we would need another approach for the first two columns. Zilog offers a high-end, ICE in-circuit emulator kit, which includes package adapters and event trace microconfroller.

The opto-isolated USB smart cable is available as a stand-alone product, and is compatible with most Z8 Encore! Simplified program memory organization. This feature replaces having a traditional microcontroller implementation of Back EMF sensing using an extra comparator and multiplexer, thus saving die area and PCB space. That is why I ended up writing two units: With an instruction queue; that is, a mechanism that keeps fetching bytes from program memory and storing them into an eight-byte array:.

Learning Electronics Need to brush up on your electronics principles? With its lightweight IDE integrated development environment and free ANSI C compiler, it is an excellent project microcontrollef learn and also teach about embedded systems.


After a lot of tests and some Googling, I figured out that it was possibly related to the asynchronous edges of the serial input signal. I then used a divider-by The Back EMF Sample Time Stamp is a patented applied microcontrokler offering a configuration that ties two existing microcontroller blocks together to add functionality to the microcontroller. These microcontrollers are packed with a very nice peripheral set, ranging from versatile bit timers to motor control timers, from multiple UARTs IrDA ready to USB devices, and much more visit www.

These multi-part series may be just what you need! That means the CPU can fetch a new instruction while another is reading or writing into data memory. In the beginning, some temporary variables are initialized to a default condition. Well, when I designin to desining out how to do all the needed tasks saving context, vectoring, managing priorities, etc.

Instead, any of the 4, possible RAM addresses can work as accumulators. Fast forward through a career of programming that included authoring some books on microcontroller programming see Resourcesstarting a small design house ScTecand finishing a post-graduation program at CEFET-SC another Brazilian university located in Ehcore. This article is focused on learning how a microcontroller core is designed, and is intended for educational use only.

Building Your Own Microcontroller | Nuts & Volts Magazine

There is also a structure IQUEUE which stores several internal parameters fetching state, read and write pointers, queue array itself, a counter, and a full indicator. Other key features include direct routing of the current sensing module to the PWM module, which enables a fast shutdown of the system during an over current fault.

An instruction usually works within a single working register group, which is selected by an SFR named RP register pointer. In order to accomplish that, RAM is split into register groups there are groups of 16 working registers each. I must say that debugging and refining the debugger code was the hardest part of this project; mostly because it interacts with all the other subsystems including buses, the decoder, and instruction queue.


The mini board features along with the EP4CE6 device: Using the FPz8 is very simple and straightforward. Following the initialization section, we can see the interrupt processing section. After a couple hours, I came desugning with the current design.

The result was absolutely weird. It then checks the available bytes in the queue and proceeds with decoding. A soft reset would make things go back to their proper operation, but that was intriguing me. Once fully compiled I used Quartus II v9.

Can you guess why? In the Z8 Encore!

When the comparator is tied to the PWM module, safe shutdown is possible, even with the loss of the oscillator. One major feature of the eZ8 programming model is the lack of a fixed accumulator. More information for Zilog Z8 Encore! Note that some instruction decoding can make use of several functions and procedures written specially for the FPz In many applications, electrical noise generated by the motor can interfere with the microcontroller’s operation.

Regarding the instruction set, there are 83 different instructions split into two opcode pages. The VHDL description of the FPz8 is large and a bit complex, so I am going to split its operation into some modules to ease comprehension:.

Building Your Own Microcontroller

On-chip peripherals such as an optimized PWM module, a fast 2. Just ignore the warning and proceed with the debugging session. Free software upgrades are available.