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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
-
-
-
-
Summary of Contents for 2000
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Page 4: ...iv Rabbit 2000 Microprocessor...
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