Nintendo GAME BOY Programming Manual page 111

RRC m
Rotates the contents of operand m to the right.
r and (HL) are used for operand m.
Examples: When C = 1h, (HL) = 0h, CY = 0,
RRC C ; C ← 80h, CY ← 1, Z ← 0, H ← 0, N ← 0
RRC (HL) ; (HL) ← 00h, CY ← 0, Z ← 1, H ← 0, N ← 0
RR
Rotates the contents of operand m to the right.
r and (HL) are used for operand m.
Examples: When A = 1h, (HL) = 8Ah, CY = 0,
RR A ; A ← 00h, CY ← 1, Z ← 1, H ← 0, N ← 0
RR (HL) ; (HL) ← 45h, CY ← 0, Z ← 0, H ← 0, N ← 0
m
7
RRC r
RRC (HL)
m
m
7
RR r
RR (HL)
CY
m
0
CY
0
CYCL 7 6 5 4 3
2 11 001
00 001
4 11 001
00 001
CY
m
0
CY
0
CYCL 7 6 5 4 3
2 11 001
00 011
4
11 011
00 011
111
Chapter 4: CPU Instruction Set
H N Z CYCL 7 6
0 0 * -- --
2 1 0
011
r
011
110
H N Z CYCL 7 6
0 0 * -- --
2 1 0
011
r
011
110
5 4 3 2 1 0
-- --
5 4 3 2 1 0
-- --