DEC ss Decrement Rabbit 2000/3000/4000 Instruction Opcode Instruction Clocks Operation ---- DEC ss 2 ss = ss - 1 0B DEC BC 2 BC = BC - 1 1B DEC DE 2 DE = DE - 1 2B DEC HL 2 HL = HL - 1 3B DEC SP 2 SP = SP - 1 Flags ALTD IOI/IOE S Z L/V C F R SP S D - - - - · Description Decrements ss (any of BC, DE, HL, or SP).
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DEC ss
DEC
2
ss = ss - 1
=
- 1
0B
DEC BC
BC = BC - 1
1B
DEC DE
DE = DE - 1
2B
DEC HL
HL = HL - 1
3B
DEC SP
SP = SP - 1
Decrements ss (any of BC, DE, HL, or SP).