Is there any EEPROM in the microcontroller??? What microcontroller has EEPROM? If so, the EEPROM a

For example, the ATMEGA8 microcontroller has 512 bytes of EEPROM inside, which can read and write bytes from any address through two registers, but cannot read and write multiple bytes at a time. The 24C02 is an EEPROM on the serial I2C bus, which needs to be programmed to complete complex timing, but can read and write multiple bytes at a time.

In comparison, the EEPROM reading and writing program inside the microcontroller is simple, and the 24C02 is complex.

What model does the single-chip microcomputer have, many single-chip microcomputers of SCT have, and 2402 is the same, and the PIC single-chip also has only the limited number of EEPROM writes inside.

There is EEPROM in the microcontroller, it is parallel communication, and AT24C02 is serial communication, which is not comparable in speed.

There is EEPROM in the microcontroller, but strictly speaking, it only uses a flash area as EEPROM, as long as the corresponding register is operated, it can be used.

The biggest difference between Flash and EEPROM is that Flash operates on a sector-by-sector basis, while EEPROM operates on a byte-by-byte basis.

The I2C bus is to define a communication protocol, that is, the data transmission mode, AT24C02N is an E2PROM chip, which is a storage device that can be saved in power failure, and this chip uses the communication protocol as the I2C bus.

The difference between E2PROM and Flash is roughly speaking.

The internal structure is not the same. Flash generally has a large capacity, a few meters to several g, and is used to store a large amount of data. E2PROMs are generally small and mainly store small amounts of data.

This is based on the two characteristics to decide, E2PROM is relatively more convenient than flash storage, can be faster, often read and write, while Flash can only change 1 to 0, and it is a page operation, before writing, it needs to be erased. The erasing time is long, and all data is 0xff after erasure. So it is used to store the program, and the e2prom stores some parameters to be saved.

The EEPROM of the microcontroller can still store data when it is powered off, because the EEPROM is an electrically erasable and programmable ROM. The memory can be cleared and rewritten when using electrical signals, which is easy to use, and the chip can right-erase or rewrite the data in it without leaving the plug-in board.

The EEPROM of the single-chip microcomputer can still store data when it is powered off, it does not have an internal power supply, it is a read-only memory, and the data will not disappear after power failure.

Here we can clearly distinguish the difference between read-only memory ROM and random access memory RAM, one is read-only, and data will be lost after power failure; And random access storage will not, it's that simple, easy to understand, right?

EEPROM is a non-volatile memory, that is, data can be stored even when the power is off, which is the characteristic of non-volatile memory.

Is there a power supply inside?

Unlike RAM, EEPROM relies on registers or gate capacitors to hold data, but rather changes in the physical structure to hold data

1. EEPROM can be connected successfully when connected to the SDA pin of the MCU, but the premise is that the pins of the MCU must be able to communicate in both directions.

2. The data saved in the RAM of the single-chip microcomputer is lost after power-off, and the data stored in the single-chip microcomputer cannot be changed at will, that is, it cannot be used to record the changed value. But in some occasions, we do need to record certain data, and they often need to be changed or updated, and the data cannot be lost after the power is off, such as the power meter degree of our home meter, the channel memory in the TV, and the EEPROM is generally used to save the data, which is characterized by no loss after the power failure.

EEPROM is a memory that is often used in microcontroller application systems, which is mainly used to save some data that needs to remain unchanged after power failure. In the previous microcontroller system, it was common to expand an EEPROM chip outside the microcontroller, which not only increased the cost, but also reduced the reliability. Nowadays, many microcontroller companies have launched microcontrollers with integrated small capacity EEPROM, which is convenient to use, reduces costs, and improves reliability.

The STM8 microcontroller chip also has an integrated EEPROM with capacities ranging from 1K to 2K bytes. The most distinctive thing is that in the STM8 microcontroller, the access to EEPROM is as convenient as the conventional RAM. The address space and memory of EEPROM are uniformly addressed, and the address starts from 004000h, and the size depends on different chip models.

The Flash program memory and data EEPROM inside the STM8 are controlled by a set of general-purpose registers. Users can use these registers to program or erase the contents of memory, set write-protection, or configure specific low-power modes. The device can also be programmed with an option byte.

Flash can be used for storage** as well as for storing data. Generally speaking, we will store the ** in the area starting from the flash, and the rest of the part will be used to store the data (your parameters can be stored in this section, the size of this part depends on the size of the flash and the size of the **space).

EEPROM is "electrically."

Erasable, Programmable, Read-Only".

The data that exists in the DRAM is lost after it is powered down, whereas the data that exists in the ERAM after it is powered off is not lost. EEPROM is electrically erasable programmable read-only memory. Under normal circumstances, EEPROM is read-only like EPROM, and when it needs to be written, it can be written or erased by adding a high voltage to the specified pin, and its erase speed is extremely fast!

Usually EEPROM chips are divided into serial EEPROM and parallel EEPROM, serial EEPROM data input and output are carried out through 2-wire, 3-wire, 4-wire or SPI bus and other interface modes, and parallel EEPROM data input.

The output is via a parallel bus.

In addition, EEPROM can store and reprogram data clearly.

Off-chip EEPROM calls the program in the ROM This is not accurate.

To be precise, programs are all called by the processor, both on-chip and off-chip, they are all uniformly addressed.

The process is that the processor reads an instruction according to the program address, that is, the PC value, and the processor then performs corresponding operations according to the instruction.

If EA is connected to a high level, the address is 4k smaller is the in-chip address, which is read from the chip, and more than 4k is the off-chip address, which is read from the off-chip.

EA is grounded, and it is completely read from outside the piece.

The call and jump are all realized by changing the PC land, the PC value is changed to **, and the processor will read the instruction from ** next time.

Off-chip EEPROM can not directly call the program in the ROM, that is, in the off-chip instruction, call or jmp is executed, the PC is changed to the address in the ROM. The next time, the processor will use the PC to read the instructions on the chip.

Write off-chip EEPROM, see how the wire is connected, and the address is related to the wiring. If you pick up the regular off-chip RAM, it will be addressed just like the regular RAM. However, it takes time to write data, and it takes a certain amount of time to write one and write another.

Yes, read operations are required, and generally EEPROM uses the IIC protocol to complete the data reading and writing.