AN2645 datasheet(32/36 Pages) STMICROELECTRONICS

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Block-by-block compatibility analysis

AN2645

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3.7.3

BootROM memory

The BootROM memory, containing the bootloader code, is present in the STM8S20xx and

STM8S105x sub-families. It is not present in the STM8S103x sub-family. The BootROM size

is 2KB and its start address is always 0x6000.

3.7.4

RAM memory

The RAM memory always starts from address 0. The first 256 bytes make up the zero page.

3.7.5

Stack

The space for the stack is always located at the end of the SRAM memory. So its position in

the address space varies depending on the SRAM memory size. The stack pointer value is

initialized to the upper address at reset and it is decremented each time a byte is pushed in.

The stack size is 1024 bytes in Performance line devices and 512 bytes in other STM8S

Table 27.

Data EEPROM memory size in bytes for each sub-family/Flash size

Sub-family

Flash Program memory size (bytes)

128K

64K

32K

16K

STM8S208x

2048

STM8S207x

2048

1536

1024

STM8S105x

1024

STM8S103x

640(1)

No read-while-write (RWW) capability

640(1)

STM8S903x

640(1)

Table 28.

Data EEPROM memory granularity in each sub-family

Sub-family

Number of pages

Page size [bytes]

Blocks per page

Block size [bytes]

STM8S20xx

up to 4

512

128

STM8S105x

up to 2

512

128

STM8S103x

STM8S903x

Table 29.

RAM memory size (bytes) for each sub-family/Flash size

Sub-family

Flash Program memory size (bytes)

128K

64K

32K

16K

STM8S208x

STM8S207x

STM8S105x

STM8S103x

STM8S903x

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