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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That way, your application code will start running following a reset signal. I ended up choosing a modern Z relative: This was in resigning, when I had more contact with programmable logic and VHDL and my curiosity was peaked.

You can set the desired communication speed as well;bps works very well for me. Among all those states, two are widely used by a lot of instructions: 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.

Regarding the instruction set, there are 83 different instructions split into two opcode pages. After thinking a bit and reading compiler output messages, I figured out that it was probably a timing issue.

Fncore feature that the Z8 Encore! Once the code is successfully downloaded, you can start the application GO buttonstep instructions, inspect or edit registers, set breakpoints, etc.

Checking the timing analysis messages, I could see a warning that the maximum clock should be around 24 MHz. Note that I am not using bidirectional buses for any interconnects in this project. Note that some instruction decoding can make use of several functions and procedures written specially for the FPz Can you guess why?


If we look at row 0x1, we can see that columns 0x0 and 0x1 are RLC instructions, and columns 0x2 up to 0x9 are ADC instructions. Subscribe to the Embedded Insights Newsletter to be notified of directory updates.

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

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. 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.

Encote its lightweight IDE integrated development environment and free ANSI C compiler, it is an excellent project to learn and also teach about embedded systems. Following the initialization section, we can see the interrupt processing section. While this is a lot, there are still some 1, logic elements available for peripherals my simple bit timer adds up to around logic elements and 61 registers. Table 1 shows program memory organization.

Building Your Own Microcontroller

The actual instruction decoding block checks whether a low power mode is not active and also if the debugger mode is off OCDCR. After a lot of tests and some Googling, I figured out that it was microontroller related to the asynchronous edges of the serial input signal.

The first implementation of FPz8 uses a very conservative and hardwired design approach with two main buses: This project took me a couple weeks to complete, but it was delightful to research and design a microcontroller core. My design had worked flawlessly in simulation.


On-chip peripherals such as an optimized PWM module, a fast 2.

Just keep in mind that the FPz8 has a volatile program memory. While this would work for columns 0x2 to 0x9, we would need another approach for the first desivning columns. That means the CPU can fetch a new instruction while another is reading or writing into data memory.

Zilog Document Download

The program memory area is organized microcontriller that the first addresses are dedicated to special purposes. 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.

Zilog offers a high-end, ICE in-circuit emulator kit, which includes package adapters and event trace functions. Decoding an INC r1 instruction is simple: My OCD design implements almost all commands available on the real hardware, except for those related to data memory debug commands 0x0C and 0x0D ; the read runtime counter 0x3 ; and the read program memory CRC 0x0E.

Before connecting, make sure that debugger settings are the same as in Figure 8.

The mini board features along with the EP4CE6 device: More information for Zilog Z8 Encore! It is responsible for detecting any pending wihh and prepares the CPU accordingly.