<< Previous | Next >>

SRA r     Shift Right Arithmetic     Rabbit 2000/3000/4000/5000 Instruction

Opcode	Instruction	Operation
----	SRA r	r = {r[7],r[7,1]}; CF = r[0]
CB 2F	SRA A	A = {A[7],A[7,1]}; CF = A[0]
CB 28	SRA B	B = {B[7],B[7,1]}; CF = B[0]
CB 29	SRA C	C = {C[7],C[7,1]}; CF = C[0]
CB 2A	SRA D	D = {D[7],D[7,1]}; CF = D[0]
CB 2B	SRA E	E = {E[7],E[7,1]}; CF = E[0]
CB 2C	SRA H	H = {H[7],H[7,1]}; CF = H[0]
CB 2D	SRA L	L = {L[7],L[7,1]}; CF = L[0]

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 2000/3000/4000	4	n/a	n/a
Rabbit 5000	4	4	2

Flags				ALTD			IOI/IOE
S	Z	L/V	C	F	R	SP	S	D
·	·	L	·	·	·

Description

Arithmetically shifts to the right the bits in r (any of the registers A, B, C, D, E, H, or L). Bits 7 through 1 are shifted to the next lowest-order bit position (bit 7 is shifted to bit 6, etc.). Bit 7 is also copied to itself. Bit 0 is shifted to the C flag. See the figure below.

Figure 22: The bit logic of the SRA instruction.