Difference between revisions of "PM Opc SAL"
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; A = 0x04 (4) | ; A = 0x04 (4) | ||
− | SAL A | + | '''SAL A''' |
; A = 0x08 (8) | ; A = 0x08 (8) | ||
; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0) | ; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0) | ||
; A = 0xFE (-2) | ; A = 0xFE (-2) | ||
− | SAL A | + | '''SAL A''' |
; A = 0xFC (-4) | ; A = 0xFC (-4) | ||
; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1) | ; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1) | ||
; B = 0x45 (69) | ; B = 0x45 (69) | ||
− | SAL B | + | '''SAL B''' |
; B = 0x8A (-124) | ; B = 0x8A (-124) | ||
; F = (Zero=0):(Carry=0):(Overflow=1):(Sign=1) | ; F = (Zero=0):(Carry=0):(Overflow=1):(Sign=1) | ||
; B = 0x84 (-124) | ; B = 0x84 (-124) | ||
− | SAL B | + | '''SAL B''' |
; B = 0x14 (20) | ; B = 0x14 (20) | ||
; F = (Zero=0):(Carry=1):(Overflow=1):(Sign=0) | ; F = (Zero=0):(Carry=1):(Overflow=1):(Sign=0) | ||
; [HL] = 0x80 (-128) | ; [HL] = 0x80 (-128) | ||
− | SAL [HL] | + | '''SAL [HL]''' |
; [HL] = 0x00 (0) | ; [HL] = 0x00 (0) | ||
; F = (Zero=1):(Carry=1):(Overflow=1):(Sign=0) | ; F = (Zero=1):(Carry=1):(Overflow=1):(Sign=0) | ||
[[PM_InstructionList|'''« Back to Instruction set''']] | [[PM_InstructionList|'''« Back to Instruction set''']] |
Revision as of 00:29, 21 April 2009
SAL = Shift Arithmetic Left
Hex | Mnemonic | Cycles |
---|---|---|
CE 80 | SAL A | 12 |
CE 81 | SAL B | 12 |
CE 82 | SAL [N+#nn] | 20 |
CE 83 | SAL [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
; SAL Ds ; ; Ds = Source/Destination Ds = Ds SHL 1
Description
"8-Bits Destination" bits are arithmetically shifted left by 1.
NOTE: This instruction can be used as an signed integer multiplication by 2.
Conditions
Zero: Set when result is 0
Carry: Set when the old bit 7 was 1
Overflow: Set when result overflow 8-bits signed range (< -128 OR > 127)
Sign: Set when bit 7 of the result is 1
Examples
; A = 0x04 (4) SAL A ; A = 0x08 (8) ; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0)
; A = 0xFE (-2) SAL A ; A = 0xFC (-4) ; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1)
; B = 0x45 (69) SAL B ; B = 0x8A (-124) ; F = (Zero=0):(Carry=0):(Overflow=1):(Sign=1)
; B = 0x84 (-124) SAL B ; B = 0x14 (20) ; F = (Zero=0):(Carry=1):(Overflow=1):(Sign=0)
; [HL] = 0x80 (-128) SAL [HL] ; [HL] = 0x00 (0) ; F = (Zero=1):(Carry=1):(Overflow=1):(Sign=0)