PM Opc SHR

SHR = Shift Right

Hex	Mnemonic	Cycles
CE 8C	SHR A	12
CE 8D	SHR B	12
CE 8E	SHR [N+#nn]	20
CE 8F	SHR [HL]	16

Execute

A       = Register A
B       = Register B
[N+#nn] = Memory: (I shl 16) or (N shl 8) or #nn
[HL]    = Memory: (I shl 16) or HL

; SHR Ds
;
; Ds = Source/Destination

Ds = Ds SHR 1

Description

"8-Bits Destination" bits are shifted right by 1.

NOTE: This instruction can be used as an unsigned integer division by 2.

Conditions

Zero: Set when result is 0

Carry: Set when the old bit 0 was 1

Sign: Set when bit 7 of the result is 1

Overflow remain unchanged

Examples

; A = 0x04 (4)
SHR A
; A = 0x02 (2)
; F = (Zero=0):(Carry=0):(Sign=0)

; B = 0x45 (69)
SHR B
; B = 0x22 (34)
; F = (Zero=0):(Carry=1):(Sign=0)

; B = 0x84 (132)
SHR B
; B = 0x42 (66)
; F = (Zero=0):(Carry=0):(Sign=0)

; [HL] = 0x01 (1)
SHR [HL]
; [HL] = 0x00 (0)
; F = (Zero=1):(Carry=1):(Sign=0)

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