While this guide expects you to have some basic knowledge of computer systems and assumes you know a program language, it should also be an interesting read for people who are interested in emulation in general. An emulator is a computer program that mimics the internal design and functionality of a computer system System A.
SHA1 Hi, One of the properties of Flash memory is that changing a 1 bit to a 0 bit is very different to changing a 0 bit to a 1 bit.
This gives you exactly the outcome you want, IF the memory starts out containing all 1s. PICs require you to do a "write" with more than one byte at a time for power and speed reasons: You can only take a large pile of bits a "row", in your case 64 bytes and change them all to 1s together.
This is called an "erase".
Using these two operations together, you can get any data you want into Flash: So if you want to fill a large region of Flash with data, you would first erase the region 64 bytes at a time, then you would write the region 8 bytes at a time.
Chris I am trying to understand how bootloaders work and was reading the PIC18 datasheets for how one would write to program memory.
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I understand that you can only erase memory in rows of 64 bytes is that correct? Read operations occur at the byte level.
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Write operations are performed on multiples of 8 bytes one block. Erase operations are performed on 64 bytes one row.This guide is intended to give a brief introduction to the world of emulation and will also teach you how to write one yourself from scratch.
Personally I have been excited about emulators since the late 90’s.
There are three types of memories in a PIC Microcontroller, The Flash Program Memory, The Data Memory (RAM) and The EEPROM Data Memory. The code that is written by the user to perform a specific task by the MCU is stored in the FPM (Flash Program Memory) of the MCU.
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FLASH_Write writes 4 flash memory locations in a row, so it needs to be called as many times as it is necessary to meet the size of the data block that will be written. P This function does not perform erase prior to write. Re: Writing to program memory on PIC18 devices In reply to this post by Mike snyder-2 BEGIN PGP SIGNED MESSAGE Hash: SHA1 Hi, One of the properties of Flash memory is that changing a 1 bit to a 0 bit is very different to changing a 0 bit to a 1 bit.