RM0312 datasheet(32/275 Pages) STMICROELECTRONICS

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Flash program memory and data EEPROM

RM0312

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DocID022352 Rev 3

with the first address. The programming cycle starts automatically when the 4 bytes have

been written.

As for byte operation, the EOP and the WR_PG_DIS control flags of FLASH_IAPSR,

together with the Flash interrupt, can be used to determine if the operation has been

correctly completed.

4.6.3

Block programming

Block program operations are much faster than byte or word program operations. In a block

program operation, a whole block is programmed or erased in a single programming cycle.

Refer to Table 5 for details on the block size according to the devices.

Block operations can be performed both to the main program memory and DATA area. They

are executed totally from RAM.

There are three possible block operations:

•

Block programming, also called standard block programming: The block is

automatically erased before being programmed.

•

Fast block programming: No previous erase operation is performed.

•

Block erase

During block programming, interrupts are masked by hardware.

Standard block programming

A standard block program operation allows a whole block to be written in one shot. The

block is automatically erase before being programmed.

To program a whole block in standard mode, the PRG bit in the FLASH_CR2 register must

be previously set to enable standard block programming (see Section 4.8.2: Flash control

sequentially to the destination addresses in the main program memory or DATA area. This

causes all the bytes of data to be latched. To start programming the whole block, all bytes of

data must be written. All bytes written in a programming sequence must be in the same

block. This means that they must have the same high address: Only the six least significant

bits of the address can change. When the last byte of the target block is loaded, the

programming starts automatically. It is preceded by an automatic erase operation of the

whole block.

The EOP and the WR_PG_DIS control flags of the FLASH_IAPSR together with the Flash

interrupt can be used to determine if the operation has been correctly completed.

Fast block programming

Fast block programming allows programming without first erasing the memory contents.

Fast block programming is therefore twice as fast as standard programming.

This mode is intended only for programming parts that have already been erased. It is very

useful for programming blank parts with the complete application code, as the time saving is

significant.

Fast block programming is performed by using the same sequence as standard block

programming. To enable fast block programming mode, the FPRG bit of the FLASH_CR2

registers must be previously set.

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