Rabbit 3000A Instruction
Instruction Reference Manual 137
Description
The System/User Mode Register, SU, is an 8 bit register that forms a stack of the current processor mode and
the previous 3 modes. SETUSR shifts the contents of SU 2 bits to the left, then sets bit 1 to 0 and bit 0 to 1,
signifying user mode.
This instruction is privileged and only implemented for the Rabbit 3000A.
SETUSR
Opcode Instruction Clocks Operation
ED 6F SETUSR 4 (2,2) SU={SU[5:0],0x01}
Flags ALTD I/O
S Z L/V C F R SP S D
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