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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One last comment regarding interrupts: Another important detail is that all instructions within the same column and group are the same size in bytes, thus can be decoded in the same decoder section.

Building Your Own Microcontroller

In many applications, electrical noise generated by the motor can interfere with the microcontroller’s operation. Thus, any program downloaded to it is lost when the FPGA is powered down. That way, your application code will start running following a reset signal. Before connecting, make withh that debugger settings are the same as in Figure 8.

The eZ8 has a variable length instruction word instruction length varies from one byte up to five bytes ; some instructions are lengthy but run faster than others. A motor control-specific development tool suite is also available for the Z8 Encore! Everything started to work perfectly!

MC, the microcontroller uses a highly accurate Internal Precision Designung as the system clock source one of a number of system clock options to aid in noise reduction. Once the code is successfully downloaded, you can wiith the application GO buttonstep instructions, inspect or edit registers, set breakpoints, etc.

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. Zilog’s DPLL digital phase lock loop control for motors runs as a timer-based interrupt service routine, and it does not require the motor to run open-loop at startup.


As I said before, eZ8 has a vectored interrupt controller with programmable priority. Checking the timing analysis messages, I could see a warning that the maximum clock should be around 24 MHz. 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:. The eZ8 core also includes a vectored interrupt controller with programmable priority and an on-chip debugger which communicates with the host computer using asynchronous serial communication.

The design makes use of a nested IF chain which generates a vector address upon detection of an interrupt event regarding an enabled interrupt.

Building Your Own Microcontroller | Nuts & Volts Magazine

Performing this action results in a smooth increase in the motor speed, as well as nearly instantaneous reversal of direction of rotation on command. Table 1 shows program memory designinh. Note that I am not using bidirectional buses for any interconnects in this project. A soft reset would make things go back to their proper operation, but that was intriguing me. One thing I would like to highlight is care is needed when microcontrooler with asynchronous signals inside FPGAs.

Embedded Insights – Embedded Processing Directory – Zilog Z8 Encore! MC

After thinking a bit and reading compiler output messages, I figured out that it was probably a timing issue.

The Back EMF signal is locked from the very onset of the start-up phase, without the need for initial placement of the rotor in a specific position. After a couple hours, I came up with the current design.

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. In the beginning, some temporary variables are initialized to a default condition. More information for Zilog Z8 Encore! With the over-current sense feature and fault input, designers can incorporate fast shutdown of the motor for anti-kick back or stall detection. 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 Florianopolis.


With an instruction queue; that is, a mechanism that keeps fetching bytes from program memory and storing them into an eight-byte array:.

Using the FPz8 is very simple and straightforward. Zilog offers a high-end, ICE in-circuit emulator kit, which includes package adapters and event trace functions.

The result was absolutely weird. I began by learning the basics while exploring the classic Zilog Z Figure 1a. The first implementation of FPz8 uses a very conservative and hardwired design approach with two main buses: That is a tough way to learn that you must always synchronize external signals prior to feeding them into complex logic!

Can you guess why? On-chip peripherals such as an optimized PWM module, a fast 2. With its lightweight IDE integrated development environment and free ANSI C compiler, it is an excellent project to learn and also teach about embedded systems. That is why I ended up writing two units: Just keep in mind that the FPz8 has a volatile program memory. You can set the desired communication speed as well;bps works very well for me.

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. Another feature that the Z8 Encore!

This project took me a couple weeks to complete, but it was delightful to research and design a microcontroller core. Figure 2 shows a block diagram of the FPz8; you can see the CPU, two memory units one for program storage and the other for data storageand also an external timer module.

The mini board features along with the EP4CE6 device: Addresses 0x and 0x are dedicated to the configuration options; addresses 0x and 0x store the reset vector; and so on. Processor Tracker – Real-time updates for select processors and development tools.