UPD17P133 Datasheet, PDF (208/289 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER

CHAPTER 18 INSTRUCTION SET
(2) ADD m, #n4
Add immediate data to data memory
<1> OP code
10
87
43
0
10000
mR
mC
n4
<2> Function
When CMP=0, (m) ← (m) + n4
Adds immediate data to the data memory contents, and stores the result in data memory.
When CMP=1, (m) + n4
The result is not stored in the data memory. Carry flag CY and zero flag Z are changed, according to the
result.
Sets carry flag CY, if a carry occurs as a result of the addition; resets the carry flag CY if no carry occurs.
If the addition result is other than zero, zero flag Z is reset, regardless of compare flag CMP.
If the addition result is zero with the compare flag reset (CMP=0), the zero flag Z is set.
If the addition result is zero with the compare flag set (CMP=1), the zero flag Z is not changed.
Addition can be executed in binary 4-bit or BCD. The BCD flag for the PSWORD specifies which kind of
addition is to be executed.
<3> Example 1
Adds 5 to the address 0.2FH contents, and stores the result in address 0.2FH:
(0.2FH) ← (0.2FH) + 5
MEM02F MEM 0.2FH
ADD MEM02F, #05H
Example 2
Adds 5 to the address 0.6FH contents and stores the result in address 0.6FH. At this time, data memory
address 0.6FH can be specified by selecting data memory address 2FH, if IXE=1, IXH=0, IXM=4, and IXL=0,
i.e., IX=0.40H.
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