Option bytes
STM8S903K3 STM8S903F3
Option byte no.
Description(1)
AFR5 Alternate function remapping option 5
0: AFR5 remapping option inactive: Default alternate function(2)
1: Port D0 alternate function = CLK_CCO.
.
AFR4 Alternate function remapping option 4
0: AFR4 remapping option inactive: Default alternate functions(2)
.
1: Port B4 alternate function = ADC_ETR; port B5 alternate function
= TIM1_BKIN.
AFR3 Alternate function remapping option 3
0: AFR3 remapping option inactive: Default alternate function(2)
.
1: Port C3 alternate function = TLI.
AFR2 Alternate function remapping option 2
0: AFR2 remapping option inactive: Default alternate functions(2)
.
1: Port C4 alternate function = AIN2; port D2 alternate function =
AIN3; port D4 alternate function = UART1_CK.
(1) Do not use more than one remapping option in the same port.
(2) Refer to pinout description.
Table 14: STM8S903F3 alternate function remapping bits [7:2] for 20-pin packages
Option byte no.
Description(1)
OPT2
AFR7 Alternate function remapping option 7
0: AFR7 remapping option inactive: Default alternate functions(2)
1: Port C3 alternate function = TIM1_CH1N; port C4 alternate
function = TIM1_CH2N.
AFR6 Alternate function remapping option 6
Reserved.
AFR5 Alternate function remapping option 5
Reserved.
AFR4 Alternate function remapping option 4
0: AFR4 remapping option inactive: Default alternate functions(2)
.
1: Port B4 alternate function = ADC_ETR; port B5 alternate function
= TIM1_BKIN.
AFR3 Alternate function remapping option 3
46/116
DocID15590 Rev 8
STMICROELECTRONICS [ ST ]
