STM8S103F2 datasheet(47/121 Pages) STMICROELECTRONICS

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STM8S103F2 STM8S103F3 STM8S103K3

Option byte

8.1

Alternate function remapping bits

OPT4

EXTCLK: External clock selection

0: External crystal connected to OSCIN/OSCOUT

1: External clock signal on OSCIN

CKAWUSEL: Auto wake-up unit/clock

0: LSI clock source selected for AWU

1: HSE clock with prescaler selected as clock source for AWU

PRSC[1:0] AWU clock prescaler

0x: 16 MHz to 128 kHz prescaler

10: 8 MHz to 128 kHz prescaler

11: 4 MHz to 128 kHz prescaler

OPT5

HSECNT[7:0]: HSE crystal oscillator stabilization time

0x00: 2048 HSE cycles

0xB4: 128 HSE cycles

0xD2: 8 HSE cycles

0xE1: 0.5 HSE cycles

Table 12. Option byte description (continued)

Option byte no.

Description

Table 13. STM8S103K3 alternate function remapping bits for 32-pin devices

Option byte no.

Description(1)

1. Do not use more than one remapping option in the same port. It is forbidden to enable both AFR1 and

AFR0.

OPT2

AFR7 Alternate function remapping option 7

Reserved.

AFR6 Alternate function remapping option 6

0: AFR6 remapping option inactive: Default alternate function.(2)

1: Port D7 alternate function = TIM1_CH4.

2. Refer to pinout description.

AFR5 Alternate function remapping option 5

0: AFR5 remapping option inactive: Default alternate function.(2)

1: Port D0 alternate function = CLK_CCO.

AFR[4:2] Alternate function remapping options 4:2

Reserved.

AFR1 Alternate function remapping option 1

0: AFR1 remapping option inactive: Default alternate functions.(2)

1: Port A3 alternate function = SPI_NSS; port D2 alternate function =

TIM2_CH3.

AFR0 Alternate function remapping option 0

Reserved.

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