store register (to memory address) instructions (put data into memory)

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str(regA, [regB, offset]) put regA into address [regA, offset]

strb(regA, [regB, offset])

strh(regA, [regB, offset]) store half-word into the address indicated by value in register + offset e.g. `strh(r1, [r0, stm.GPIO_BSRRL])