RM0312 datasheet(28/275 Pages) STMICROELECTRONICS

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Flash program memory and data EEPROM

RM0312

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DocID022352 Rev 3

Figure 5. UBC area size definition for touch sensing STM8TL5xxx devices

1. UBC[7:0]= 0x00 means no memory space is allocated for the UBC area.

2. Page 255 is reserved for the main program area or data EEPROM.

4.4.3

Data EEPROM (DATA)

The data EEPROM area can be used to store application data. By default, the DATA area is

write protected to prevent unintentional modification when the main program is updated in

IAP mode. The write protection can be unlocked only by using a specific MASS key

sequence (refer to Enabling write access to the DATA area).

The size of the DATA area can be configured through the DATA option byte (DATASIZE) in

ICP mode. This option byte specifies the number of pages (64 bytes) starting down from

address 0x00 BFFF.

The maximum size of the DATA area is of 2 Kbytes, corresponding to start address

0x00 B800 (see Figure 4) i.e. up to 32 pages of 64 bytes can be defined as data EEPROM.

4.4.4

Main program area

The main program is the area which starts at the end of the UBC or PCODE and ends at

address 0x00 BFFF. It is used to store the application code (see Figure 4).

4.4.5

Option bytes

The option bytes are used to configure device hardware features and memory protection.

They are located in a dedicated memory array of one block.

The option bytes can be modified only in ICP/SWIM mode with OPT bit of the FLASH_CR2

0x00 BFFF

0x00 BFBF

0x00 BF7F

0x 00 BF3F

0x 00 BEBF

0x00 80FF

0x 00 80BF

0x 00 807F

Page 254

Page 253

Page 252

Page 251

Page 3

Page 2

Page 1

Page 0

0x00 8000

Interrupt vector table

64 bytes

64bytes

Interrupt vector table

3 pages to 255 pages

255 pages

User boot code area(2)

UBC[7:0] =0x03

192 bytes

64 bytes

Page 255

0x00 803F

0x00 BEFF

UBC[7:0]

≤ 0xFF

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