Write to register
rwr <reg> <value>
<value> to active target register specified by
<reg>. For a processor core target, the processor core register can be written to. For a target representing a group of processor cores, system registers or IOU registers can be written to.
Nothing, if successful. Error string, if an invalid register is specified or the register cannot be written to.
rwr r8 0x0
Write 0x0 to register r8.
rwr usr r8 0x0
Write 0x0 to register r8 in group usr.