STM8S003K3(2012) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM8S003K3
(Rev.:2012)

Value line, 16 MHz STM8S 8-bit MCU, 8 Kbytes Flash, 128 bytes data EEPROM, 10-bit ADC, 3 timers, UART, SPI, I²C

STMicroelectronics 

STM8S003K3 STM8S003F3

Option bytes

8

Option bytes

Option bytes contain configurations for device hardware features as well as the memory

protection of the device. They are stored in a dedicated block of the memory. Except for the

ROP (read-out protection) byte, each option byte has to be stored twice, in a regular form

(OPTx) and a complemented one (NOPTx) for redundancy.

Option bytes can be modified in ICP mode (via SWIM) by accessing the EEPROM address

shown in the table below.

Option bytes can also be modified ‘on the fly’ by the application in IAP mode, except the ROP

option that can only be modified in ICP mode (via SWIM).

Refer to the STM8S Flash programming manual (PM0051) and STM8 SWIM communication

protocol and debug module user manual (UM0470) for information on SWIM programming

procedures.

Table 11: Option bytes

Addr.

Option

name

Option Option bits

byte no.

7

6

5

4

3

2

1

Factory

default

0

setting

0x4800

Read-out

protection

(ROP)

OPT0

ROP [7:0]

0x00

0x4801 User boot OPT1 UBC [7:0]

code(UBC)

0x4802

NOPT1 NUBC [7:0]

0x00

0xFF

0x4803

0x4804

Alternate

function

remapping

(AFR)

OPT2

NOPT2

AFR7

NAFR7

AFR6 AFR5 AFR4

NAFR6 NAFR5 NAFR4

AFR3

NAFR3

AFR2 AFR1 AFR0 0x00

NAFR2 NAFR1 NAFR0 0xFF

0x4805h Miscell.

option

OPT3 Reserved

HSI

TRIM

LSI_ EN IWDG WWDG WWDG 0x00

_HW _HW _HALT

0x4806

NOPT3 Reserved

NHSI

TRIM

NLSI_

EN

NIWDG NWWDG NWW

0xFF

_HW _HW G_HALT

0x4807 Clock

option

OPT4 Reserved

EXT CLK CKAWU PRS C1 PRS C0 0x00

SEL

0x4808

NOPT4 Reserved

NEXT

CLK

NCKA NPRSC1 NPR

WUSEL

SC0

0xFF

0x4809 HSE clock OPT5 HSECNT [7:0]

startup

0x480A

NOPT5 NHSECNT [7:0]

0x00

0xFF

Option byte no.

OPT0

Table 12: Option byte description

Description

ROP[7:0] Memory readout protection (ROP)

0xAA: Enable readout protection (write access via SWIM protocol)

DocID018576 Rev 3

41/100

Share Link: