2.6.4.4.1 Syntax

op{type}T{cond} Rt, [Rn {, #offset}]      ; immediate offset

where:

• op is either LDR (load register) or STR (store register)
• type is one of:
  • B: unsigned byte, zero extend to 32 bits on loads.
  • SB: signed byte, sign extend to 32 bits (LDR only).
  • H: unsigned halfword, zero extend to 32 bits on loads.
  • SH: signed halfword, sign extend to 32 bits (LDR only).
  • -: omit, for word.
• cond is an optional condition code, refer to 2.6.3.7 Conditional Execution.
• Rt is the register to load or store.
• Rn is the register on which the memory address is based.
• offset is an offset from Rn and can be 0 to 255. If offset is omitted, the address is the value in Rn.