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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You can supply a hex file and use the MegaWizard Plug-in Manager to change the program wkth initialization file. I ended up choosing a modern Z relative: Can you guess why?
Building Your Own Microcontroller
My design had worked flawlessly in simulation. That is a tough way to learn that you must always synchronize external mcirocontroller prior to feeding them into complex logic!
One major feature of the eZ8 programming model is the lack of a fixed accumulator. Thus, any program downloaded to it is lost when the FPGA is powered down. Once fully compiled I used Quartus II v9. MC which eliminates the need for an external comparator. A motor control-specific development tool suite is also available for the Z8 Encore! Need to brush up on your electronics principles?
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.
To my surprise, while most of the time I could successfully send commands and receive the expected results, sometimes the design would simply freeze and stop responding. The instruction decoder reads opcodes from the instruction queue and translates them into corresponding operations.
microconfroller Just ignore the warning and proceed with the debugging session. 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.
The Current Sampling Amplifier is another patent-applied, function that eliminates Time-dependent Sampling of the motor current.
I began by learning the basics while exploring the classic Zilog Z Figure 1a. On-chip peripherals such as an optimized PWM module, a fast 2.
While this would work for columns 0x2 to 0x9, we would need another approach for the first two columns.
Z8Encore! Applications Library
vesigning Note that I am not using bidirectional buses for any interconnects in this project. This is where the actual magic happens. The five register area buses comprise three for the file register area user RAMand another two dedicated designinb special function registers. Everything started to work perfectly! This is where the decoder actually decodes the opcodes, prepares buses and internal supporting signals, and steps to other execution states.
This article is focused on learning how a microcontroller core is designed, and is intended for educational use only. 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 witj specific position. The queue counter CNT is used to identify the number of bytes available for use reading in the queue.
Zilog woth a high-end, ICE in-circuit emulator kit, which includes package adapters and event trace functions. It is responsible for detecting any pending interrupts and prepares the CPU accordingly. The Back EMF Sample Time Stamp is a patented applied function offering a configuration that ties two existing microcontroller blocks together to add functionality to the microcontroller. After a couple hours, I came up with the current design. Other key features include micgocontroller routing of the current sensing module to the PWM module, which enables a fast shutdown of the system during an desogning current fault.
In the beginning, some temporary variables are initialized to a default condition. When the comparator is tied to the PWM module, safe shutdown is possible, even with the loss of the oscillator. Following the initialization section, we micdocontroller see the interrupt processing section. Note that some instruction decoding can make use of several functions and procedures written specially for the FPz I then included a cascaded latch to synchronize the signal to my internal clock and all the problems were gone!
Table 1 shows program memory organization. Performing this action results in a smooth increase in the motor speed, as well as nearly instantaneous reversal of direction of rotation on command. Subscribe to the Embedded Insights Newsletter to be notified of directory updates.
Zilog Document Download
Once the code is successfully downloaded, you can start the application GO buttonstep instructions, inspect or edit registers, set breakpoints, etc. Processor Tracker – Real-time updates for select processors and development tools. I then used a divider-by The interrupt flag register IRQ0 samples interrupt inputs every rising edge of the system clock.
The result was absolutely weird. A soft reset would microcontrolleg things go back to their proper operation, but that was intriguing me. At first, I thought this section would not be so difficult because interrupts are no big deal, right? Free software upgrades are available.
The decoder stage uses this number to verify that the desired number of bytes for the instruction is already available in the queue. With the over-current sense feature and fault input, designers can incorporate fast shutdown of the motor for anti-kick back or stall detection.