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4.5.2.5 Extended Emulated Instructions
The extended instructions together with the constant generator form the extended emulated instructions.
Table 4-15 lists the emulated instructions.
Table 4-15. Extended Emulated Instructions
Instruction Explanation Emulation
Add carry to dst
ADCX(.B,.A) dst ADDCX(.B,.A) #0,dst
Branch indirect dst
BRA dst MOVA dst,PC
Return from subroutine
RETA MOVA @SP+,PC
Clear Rdst
CLRA Rdst MOV #0,Rdst
Clear dst
CLRX(.B,.A) dst MOVX(.B,.A) #0,dst
Add carry to dst decimally
DADCX(.B,.A) dst DADDX(.B,.A) #0,dst
Decrement dst by 1
DECX(.B,.A) dst SUBX(.B,.A) #1,dst
Decrement Rdst by 2
DECDA Rdst SUBA #2,Rdst
Decrement dst by 2
DECDX(.B,.A) dst SUBX(.B,.A) #2,dst
Increment dst by 1
INCX(.B,.A) dst ADDX(.B,.A) #1,dst
Increment Rdst by 2
INCDA Rdst ADDA #2,Rdst
Increment dst by 2
INCDX(.B,.A) dst ADDX(.B,.A) #2,dst
Invert dst
INVX(.B,.A) dst XORX(.B,.A) #-1,dst
Shift left dst arithmetically
RLAX(.B,.A) dst ADDX(.B,.A) dst,dst
Shift left dst logically through carry
RLCX(.B,.A) dst ADDCX(.B,.A) dst,dst
Subtract carry from dst
SBCX(.B,.A) dst SUBCX(.B,.A) #0,dst
Test Rdst (compare with 0)
TSTA Rdst CMPA #0,Rdst
Test dst (compare with 0)
TSTX(.B,.A) dst CMPX(.B,.A) #0,dst
Pop to dst
POPX dst MOVX(.B, .A) @SP+,dst
155
SLAU144J–December 2004–Revised July 2013 CPUX
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