STM8S datasheet(49/467 Pages) STMICROELECTRONICS

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Flash program memory and data EEPROM

The HVOFF flag can also be polled by the application which can execute other instructions

(RWW) during the actual programming phase of the DATA.

The EOP and WR_PG_DIS bits of the FLASH_IAPSR register can be checked to determine

if the fast block programming operation has been correctly completed.

Caution:

The data programmed in the block are not guaranteed when the block is not blank before

the fast block program operation.

Block erasing

A block erase allows a whole block to be erased.

To erase a whole block, the ERASE/NERASE bits in the FLASH_CR2 and FLASH_NCR2

registers must be previously set/cleared to enable block erasing (see Section 4.8.2: Flash

control register 2 (FLASH_CR2) and Section 4.8.3: Flash complementary control register 2

(FLASH_NCR2)). The block is then erased by writing ‘0x00 00 00 00’ to any word inside the

block. The word start address must end with ‘0’, ‘4’, ‘8’, or ‘C’.

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.

4.6.5

Option byte programming

Option byte programming is very similar to data EEPROM byte programming.

The application writes directly to the target address. The program does not stop and the

write operation is performed using the RWW capability.

Refer to the datasheet for details of the option byte contents.

4.7

ICP (in-circuit programming) and IAP (in-application

programming)

The in-circuit programming (ICP) method is used to update the entire content of the memory,

using the SWIM interface to load the user application into the microcontroller. ICP offers

quick and efficient design iterations and eliminates unnecessary package handling or

socketing of devices. The SWIM interface (single wire interface module) uses the SWIM pin

to connect to the programming tool.

In contrast to the ICP method, in-application programming (IAP) can use any communication

interface supported by the microcontroller (I/Os, I2C, SPI, USART...) to download the data to

be programmed in the memory. IAP allows the Flash program memory content to be

reprogrammed during application execution. Nevertheless, part of the application must have

been previously programmed in the Flash program memory using ICP.

Table 5. Block size

STM8 microcontroller family

Block size

Low density STM8S and STM8AF

64 bytes

Medium density STM8S and STM8AF (up to 32 Kbytes)

128 bytes

High density STM8S and STM8AF (up to 128 Kbytes)

128 bytes

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