SRA b,BCDE
SRA b,JKHL     Shift Right Arithmetical     Rabbit 4000 Instruction

Opcode	Instruction	Clocks	Operation
----	SRA b,BCDE	4 (2,2)	BCDE = {B[7],BCDE[31,1]}   CF = E[0]   b = b - 1 repeat while b != 0
DD 98	SRA 1,BCDE	4 (2,2)	repeat the operation 1 time
DD 99	SRA 2,BCDE	4 (2,2)	repeat the operation 2 times
DD 9B	SRA 4,BCDE	4 (2,2)	repeat the operation 4 times
----	SRA b,JKHL	4 (2,2)	JKHL = {J[7],JKHL[31,1]}   CF = L[0]   b = b - 1 repeat while b != 0
FD 98	SRA 1,JKHL	4 (2,2)	repeat the operation 1 time
FD 99	SRA 2,JKHL	4 (2,2)	repeat the operation 2 times
FD 9B	SRA 4,JKHL	4 (2,2)	repeat the operation 4 times

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

Description

Arithmetically shifts to the right the bits of the data in register BCDE or JKHL. Bits 1 through 31 are each shifted to the next lowest-order bit position. The highest-order bit of BCDE or JKHL is shifted into itself and the lowest-order bit is shifted to the C flag. See the figure below.

Figure 21: The bit logic of the SRA instruction.

The instruction repeats the number of times specified by b which can be 1, 2 or 4.