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DP805X View Datasheet(PDF) - Digital Core Design

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DP805X Datasheet PDF : 79 Pages
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DP805x Instructions set details
- 31 -
3.10. DEC
Instruction: DEC byte
Function: Decrement byte
Description: The variable indicated is decremented by 1. An original value of 00 H
will underflow to 0FF H. No flags are affected. Four operand addressing
modes are allowed: accumulator, register, direct, or register-indirect.
Note:
When this instruction is used to modify an output port, the value used
as the original port data will be read from the output data latch, not the
input pins.
3.10.1.
DEC A
Operation: (PC) (PC) + 1
(A) (A) - 1
Bytes:
1
Cycles:
1
Encoding:
00010100
3.10.2.
DEC RN
Operation: (PC) (PC) + 1
(Rn) (Rn) - 1
Bytes:
1
Cycles:
2
Encoding:
00011 r r r
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