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chapter-instr-glance-block.tex
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chapter-instr-glance-block.tex
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\section{Block Transfer, Search}
\begin{minipage}{\textwidth}
\begin{instrtable}
\begin{instruction}{CPD}
\Symbol{\SymCPD[0]}
\FlagsCPD
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\SkipToSymbol
\Symbol{\SymCPD[1]}
\FromSymbolToOpCode
\OpCode{10}{101}{001}
\Hex{A9}{}
\SkipToSymbol
\Symbol{\SymCPD[2]}
\end{instruction}
\begin{instruction}{CPDR}
\Symbol{\SymCPDR[0]}
\FlagsCPDR
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\Comment{if {\tt A=(HL)}}
\SkipToSymbol
\Symbol{\SymCPDR[1]}
\FromSymbolToOpCode
\OpCode{10}{111}{001}
\Hex{B9}{}
\Cycles{}{}
\Comment{or {\tt BC}=0}
\SkipToOpCode
\OpCode{}{}{}
\Hex{}{}
\Cycles{5}{21}
\Comment{if {\tt A}$\neq${\tt (HL)}}
\SkipToOpCode
\OpCode{}{}{}
\Hex{}{}
\Cycles{}{}
\Comment{and {\tt BC}$\neq${\tt 0}}
\end{instruction}
\begin{instruction}{CPI}
\Symbol{\SymCPI[0]}
\FlagsCPI
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\SkipToSymbol
\Symbol{\SymCPI[1]}
\FromSymbolToOpCode
\OpCode{10}{100}{001}
\Hex{A1}{}
\SkipToSymbol
\Symbol{\SymCPI[2]}
\end{instruction}
\begin{instruction}{CPIR}
\Symbol{\SymCPIR[0]}
\FlagsCPIR
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\Comment{if {\tt A=(HL)}}
\SkipToSymbol
\Symbol{\SymCPIR[1]}
\FromSymbolToOpCode
\OpCode{10}{110}{001}
\Hex{B1}{}
\Cycles{}{}
\Comment{or {\tt BC}=0}
\SkipToOpCode
\OpCode{}{}{}
\Hex{}{}
\Cycles{5}{21}
\Comment{if {\tt A}$\neq${\tt (HL)}}
\SkipToOpCode
\OpCode{}{}{}
\Hex{}{}
\Cycles{}{}
\Comment{and {\tt BC}$\neq$0}
\end{instruction}
\begin{instruction}{LDD}
\Symbol{\SymLDD[0]}
\FlagsLDD
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\SkipToSymbol
\Symbol{\SymLDD[1]}
\FromSymbolToOpCode
\OpCode{10}{101}{000}
\Hex{A8}{}
\SkipToSymbol
\Symbol{\SymLDD[2]}
\SkipToSymbol
\Symbol{\SymLDD[3]}
\end{instruction}
\begin{instruction}{LDDR}
\Symbol{\SymLDDR[0]}
\FlagsLDDR
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\Comment{if {\tt BC=0}}
\SkipToSymbol
\Symbol{\SymLDDR[1]}
\FromSymbolToOpCode
\OpCode{10}{111}{000}
\Hex{B8}{}
\Cycles{5}{21}
\Comment{if {\tt BC$\neq$0}}
\end{instruction}
\begin{instruction}{LDI}
\Symbol{\SymLDI[0]}
\FlagsLDI
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\SkipToSymbol
\Symbol{\SymLDI[1]}
\FromSymbolToOpCode
\OpCode{10}{100}{000}
\Hex{A0}{}
\SkipToSymbol
\Symbol{\SymLDI[2]}
\SkipToSymbol
\Symbol{\SymLDI[3]}
\end{instruction}
\begin{lastinstruction}{LDIR}
\Symbol{\SymLDIR[0]}
\FlagsLDIR
\OpCode{11}{101}{101}
\Hex{ED}{2}
\Cycles{4}{16}
\Comment{if {\tt BC=0}}
\SkipToSymbol
\Symbol{\SymLDIR[1]}
\FromSymbolToOpCode
\OpCode{10}{110}{000}
\Hex{B0}{}
\Cycles{5}{21}
\Comment{if {\tt BC$\neq$0}}
\end{lastinstruction}
\end{instrtable}
\begin{notestable}
\NoteItem{\See{1}See section \XRef{z80_undocumented_instructions_memory_block} for a description}
\NoteItem{\See{2}ZF is {\tt 1} if {\tt A=(HL)}, otherwise {\tt 0}}
\NoteItem{\See{3}PV is {\tt 1} if {\tt BC$\neq$0} after execution, otherwise {\tt 0}}
\NoteItem{\See{4}PV is {\tt 0} only at the completion of the instruction}
\end{notestable}
\end{minipage}