SHR = Shift Right
| Hex | Mnemonic | Cycles |
|---|---|---|
| CE 8C | SHR A | 12 |
| CE 8D | SHR B | 12 |
| CE 8E nn | 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)