| Operation: |
DEC |
| Function: |
Decrement Register |
| Syntax: |
DEC register |
| Instructions |
OpCode |
Bytes |
Cycles |
Flags |
| DEC A |
0x14 |
1 |
1 |
None |
| DEC iram addr |
0x15 |
2 |
1 |
None |
| DEC @R0 |
0x16 |
1 |
1 |
None |
| DEC @R1 |
0x17 |
1 |
1 |
None |
| DEC R0 |
0x18 |
1 |
1 |
None |
| DEC R1 |
0x19 |
1 |
1 |
None |
| DEC R2 |
0x1A |
1 |
1 |
None |
| DEC R3 |
0x1B |
1 |
1 |
None |
| DEC R4 |
0x1C |
1 |
1 |
None |
| DEC R5 |
0x1D |
1 |
1 |
None |
| DEC R6 |
0x1E |
1 |
1 |
None |
| DEC R7 |
0x1F |
1 |
1 |
None |
Description: DEC decrements the value of register by 1. If the initial value of register is 0, decrementing the value will cause it to reset to 255 (0xFF Hex). Note: The Carry Flag is NOT set when the value "rolls over" from 0 to 255.
See Also: INC, SUBB, Instruction Set |
