| Line 976... |
Line 976... |
& \hbox{\tt MOV.cond \$Addr+PC,PC}
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& \hbox{\tt MOV.cond \$Addr+PC,PC}
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& Branch or jump on condition. Works for 13--bit
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& Branch or jump on condition. Works for 13--bit
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signed address offsets.\\\hline
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signed address offsets.\\\hline
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{\tt BRA.Cond +/-\$Addr}
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{\tt BRA.Cond +/-\$Addr}
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& \parbox[t]{1.5in}{\tt LDI \$Addr,Rx \\ ADD.cond Rx,PC}
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& \parbox[t]{1.5in}{\tt LDI \$Addr,Rx \\ ADD.cond Rx,PC}
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& Branch/jump on condition. Works for
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& Branch/jump on condition. Works for 23 bit address offsets, but
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23 bit address offsets, but costs a register, an extra instruction,
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costs a register and an extra instruction. With LDIHI and LDILO
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and sets the flags. \\\hline
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this can be made to work anywhere in the 32-bit address space, but yet
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cost an additional instruction still. \\\hline
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{\tt BNC PC+\$Addr}
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{\tt BNC PC+\$Addr}
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& \parbox[t]{1.5in}{\tt Test \$Carry,CC \\ MOV.Z PC+\$Addr,PC}
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& \parbox[t]{1.5in}{\tt Test \$Carry,CC \\ MOV.Z PC+\$Addr,PC}
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& Example of a branch on an unsupported
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& Example of a branch on an unsupported
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condition, in this case a branch on not carry \\\hline
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condition, in this case a branch on not carry \\\hline
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{\tt BUSY } & {\tt MOV \$-1(PC),PC} & Execute an infinite loop \\\hline
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{\tt BUSY } & {\tt MOV \$-1(PC),PC} & Execute an infinite loop \\\hline
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