I am writing stm32f051R8Tx assembly programming. I would like to know where can i find the predeclared register names of each peripherals? is there any document which list them all? Please do help.

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The Reference Manual? https://www.st.com/resource/en/reference_manual/rm0091-stm32f0x1stm32f0x2stm32f0x8-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

Via an .SVD file https://www.keil.com/pack/doc/CMSIS/SVD/html/svd_Format_pg.html

Via an CMSIS include file you can use directly or translate into a form consumable by the assembler. STM32Cube_FW_F0_V1.10.0\Drivers\CMSIS\Device\ST\STM32F0xx\Include\stm32f051x8.h

https://www.st.com/resource/en/programming_manual/pm0215-stm32f0xxx-cortexm0-programming-manual-stmicroelectronics.pdf