Unfortunately, it has unwanted side effects in certain atypical applications such as you've described. In most circumstances, this results in significantly faster EEPROM programming times than you could achieve if each byte was being individually erased and then written. The address bus of the EEPROM (up to 15 bit) is controlled via two daisy-chained 74HC595 shift. Instead, the erase cycle in Programming mode is tied (via a fuse setting) directly to the global Chip Erase command, and all of EEPROM is erased simultaneously in one batch. The heart of the EEPROM programmer is an ATmega8 microcontroller. To this end, the EEPROM programming procedure is always different in Programming mode than it is in running mode - the erase cycle is never implied by an individual EEPROM write command. In Programming mode, the first priority is usually to get the various memories programmed as quickly as possible.
ATMEL EEPROM PROGRAMMER SOFTWARE
In newer AVR models, it is possible to write software that selectively enables and disables the erase portion (or the write portion) of the write procedure, with the benefit of potentially doubling certain write times.
Both parts of the process take about the same amount of time. However, it has the side effect of potentially costing extra time, since it effectively has to reset each and every bit from a 0 to a 1 first, and then set selectively set some of those bits back from a 1 to a 0. This makes it a relatively simple medium to work with from a software development point of view. While running regular firmware, the ATmega128 always erases the previous contents of individual EEPROM bytes as part of every write operation. I know you've already got a workaround, but for what it's worth, here are my observations: Since an erase is evidently part of the write cycle, why is what AVR Studio does different? It seems practically useless for the JTAG interface to the chip to be unable to erase the EEPROM.
Thecolororange wrote: From reading the documentation, the ATmega128 has commands to read from and write to the EEPROM. What I'm trying to do doesn't seem like that strange of a thing to be doing.
ATMEL EEPROM PROGRAMMER SERIAL
I know I could write some code that would let me change the values over a serial connection or something, but I'd rather not do that. Is there a way to just erase the EEPROM using AVR Studio? I've searched google and these forums for an answer, but everything is about changing the values in EEPROM from inside the code, not reprogramming the EEPROM. It works when I erase the chip before programming the EEPROM, but that's exactly what I'm trying to avoid (erasing the chip each time, that is). WARNING: EEPROM address 0x003B is 0x01 (should be 0x03). However, when I try to program the EEPROM on my ATmega128, AVR Studio shows the following: I decided to use EEPROM to store the variables, and wanted to be able to reprogram the EEPROM with updated values when needed. It seemed ridiculous to reprogram my processor's flash when all I did was change a couple bytes in some array. They have many electronic and industrial applications such as controlling a vehicle's engine output and fuel delivery.In a project I am working on, I have several variables and arrays that I am trying to fine-tune. What are chip programmers used for?Ĭhip programmers eliminate the need for mechanical switches when programming. A software program on the computer transfers data to the chip programmer selects the interface type as well as the device and then begins the process of programming. Some devices require data on the serial pins while others receive the data via a serial interface.Ĭhip programmers are connected to a computer via a USB, parallel port or Local Area Network (LAN) interface.
Signals are transmitted through the connection pins of the chip programmer into the target device. These type of programmer devices configure the device via the socket on the programming equipment or by configuring the device on a PCB (printed circuit board).
ATMEL EEPROM PROGRAMMER INSTALL
This item don’t have any use manual, you only need to install the driver or programming downloader on your PC, and place the chip on the. ) USB interface communications and power supply, high communication speed, and no need external power supply, use USB IC CH341. In the case of EPROMs, once they have been programmed, they can be erased with the use of an EPROM UV eraser. SP200S+ USB ISP Programmer (For MCUs, EEPROM, etc) ( There are no reviews yet.
They support a broad range of chip sets such as EPROMs, EEPROMs and flash, ROMs, GALs and microcontrollers. Chip programmers known as device programmers or IC programmers are items of electronic equipment that arrange written software to configure programmable devices.