Try the STM8S Reference Manual :https://www.st.com/resource/en/reference_manual/cd00190271-stm8s-series-and-stm8af-series-8-bit-microcontrollers-stmicroelectronics.pdfand the STM8 CPU programming manual:https://www.st.com/resource/en/programming_manu...
Hi MBhir.1,the NUCLEO-L152RE board has the functionality to evaluate the STM32L151RCT6.It contains an STM32L152RET6 which has a built-in LCD controller and more memory than the 'L151RC, but you don't have to use the additional features.I've used this...