BNC

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The Branch on No Carry opcode (BNC) is a two-decle opcode that is a part of the [[Branch]] family of opcodes.  This instruction causes the [[CP1610]] to branch if the [[Carry Flag]] is clear to the address specified by the following parameters.<br/>
The Branch on No Carry opcode (BNC) is a two-decle opcode that is a part of the [[Branch]] family of opcodes.  This instruction causes the [[CP1610]] to branch if the [[Carry Flag]] is clear to the address specified by the following parameters.<br/>
-
     Format - Decle #1    Format - Word #2 (Unknown if all 16 bits are significant)
+
     Format - Decle #1    Format - Word #2 (All 16 bits are significant)
     0000:0010:00d0:1001  aaaa:aaaa:aaaa:aaaa<br/>
     0000:0010:00d0:1001  aaaa:aaaa:aaaa:aaaa<br/>
     where:<br/>
     where:<br/>

Revision as of 18:49, 12 January 2005

Instruction NameBranch on No Carry
MnemonicsBC
CP1610 Clock Cycles7 or 9
InterruptibleYes
Opcode Range$0209, $0229

The Branch on No Carry opcode (BNC) is a two-decle opcode that is a part of the Branch family of opcodes. This instruction causes the CP1610 to branch if the Carry Flag is clear to the address specified by the following parameters.

   Format - Decle #1    Format - Word #2 (All 16 bits are significant)
   0000:0010:00d0:1001  aaaa:aaaa:aaaa:aaaa
where:
d indicates the direction of the branch such that: d == 0 indicates to branch in the forward direction d == 1 indicates to branch in the reverse direction
aaaaaaaaaaaaaaaa indicates the amount of offset

See the Branch opcode family documentation for more information.

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