selected data does not fit into selected flash sectors

In-circuit programming of flash memory in user mode (U-ICP) is a technique by which user programs stored in flash memory can modify data or programs also stored in the flash memory during run time. In-circuit programming concepts of flash memory So generally, erase should be carried out before perform.ġ.3. That is, the field is blank (the content is $FF). Besides, before programming, it should be insured that the program field has not been written after last erasure. During erasing and programming, voltage higher than the power is usually needed and it is generated by Coldfire MCU inner electric charge pump. The latter, which converts bit to 0, can program only one word at a time. The former, which converts all bits to 1, consists of mass erase and page erase. However, different from the reading/writing of generic RAM, flash memory operations need two special processes-Erase and Program.

The ColdFire MCU family provides the function of in-system programming of flash memory in user mode instead of EEPROM, hence making the circuit design simpler and cost lower. In many embedded systems, the memory which can protect program parameters and important data without external power supply is necessary as EEPROM previously was.

Low-cost, high-density and reliability: The parameters are much better than EEPROM (or E2PROM). Non-volatility: Flash memory protects data without power supply the same as magnetic storage.ĮEPROM-Electrically Programmable Read-Only-Memory, the electrical erasure of flash memory shortens the programming cycle for developers and makes end users’ updating memory become true. Hence flash memory makes MCU progress enormously.įlash memory is really a high-density, high-performance reading/writing memory with non-volatility, low-power and high-reliability and has the following characteristics comparing with old solid state memory. With the maturity of the Flash technology, now more and more above characteristics are integrated to MCU and become an important part of it. These are just what MCU are expecting, because MCU with internal flash memory introduced in earlier years has some shortages in reliability and stability. It is endowed with characteristics such as electrical erasure, data preservation without power supply, in-system programming, high storage density, low power consumption and low cost. With the maturity of its technology, flash memory has become an ideal memory in recent years. But only one or several specialties are implemented in general memory.

The most perfect memory should be a high-speed, non-volatile, low-cost and high-density memory. Some instances are also provided in this chapter. Besides, we discuss the protection mechanisms and security operations for AW60/XS128/MCF52233 Flash memory. The programming method of the other MCUs in the whole Freescale S08/S12/ColdFire MCU family is similar. Take AW60/XS128/MCF52233 in Freescale 8/16/32bits S08/S12/ColdFire serials’ MCUs for example, we elaborate the In-Circuit Programming method of Flash memory in this chapter. In-Circuit Programmer Mode means erasing/programming some region of Flash by MCU’s internal programs during run time, with the purpose of saving relevant data and preventing from lost after power off. Programmer Mode means erasing/programming Flash by programming tool (programmer), with the purpose of writing programs into MCU The programming methods of Flash memory include Programmer Mode and In-Circuit Programmer Mode. The features of Flash memory include electrically erasable, no back-up power to protect data, in-circuit programming, high-density memory, low-cost and so on, which rapidly increase the using of Flash memory in embedded system.

Selected data does not fit into selected flash sectors