Intel 210200-002 manual Carry Right, RCR destination, count

RCR ROTATE THROUGH RCR

CARRY RIGHT

Operation:	Flags Affected:
(temp) - COUNT	CF,OF
do while (temp) =1= 0
(tmpcf) - (CF)
(CF) - low-order bit of (EA)
(EA) - (EA) I 2
high-order bit of (EA) - (tmpcf)
(temp) - (temp)-1
if COUNT = 1 then
if high-order bit of (EA) =1= next-
to-high-order bit of (EA)
then (OF)-1
else (OF) - 0
else (OF) undefined
Description:
RCR destination, count

RCR (Rotate through Carry Right) operates exactly like RCL except that the bits are rotated right instead of left.

Encoding:

11101 aav w 1mod 011 rIm 1

if v = 0 then COU NT = 1 else COU NT = (CL)

RCR Operands	Clocks	Transfers Bytes		RCR Coding Example
register, 1	2	-	2	RCR BX, 1
register, CL	8+4/bit	-	2	RCR BL, CL
memory, 1	15(23) + EA	2	2-4	RCR [BXj.STATUS, 1
memory, CL	20(28) + EA + 4/bit	2	2-4	RCR ARRAY [01], CL

*b(w): where b denotes the number of clock cycles for byte operands and w denotes the number of clock cycles for word operands.

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