Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

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SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

An instruction operand can be an ARM register, a constant, or another instruction-specific parameter. Instructions 

act on the operands and often store the result in a destination register. When there is a destination register in the 

instruction, it is usually specified before the operands. 
Operands in some instructions are flexible, can either be a register or a constant. See 

Many instructions have restrictions on whether the Program Counter (PC) or Stack Pointer (SP) for the operands 

or destination register can be used. See instruction descriptions for more information.