DR805X Datasheet, PDF (7/79 Pages) Digital Core Design – 8-bit RISC Microcontroller Instructions set details ver 3.10

DR805x Instructions set details
-7-
2.2. INSTRUCTION SET BRIEF – FUNCTIONAL ORDER
2.2.1. ARITHMETIC OPERATIONS
Mnemonic
ADD A,Rn
ADD A,direct
ADD A,@Ri
ADD A,#data
ADDC A,Rn
ADDC A,direct
ADDC A,@Ri
ADDC A,#data
SUBB A,Rn
SUBB A,direct
SUBB A,@Ri
SUBB A,#data
INC A
INC Rn
INC direct
INC @Ri
DEC A
DEC Rn
DEC direct
DEC @Ri
INC DPTR
MUL A,B
DIV A,B
DA A
Description
Add register to accumulator
Add direct byte to accumulator
Add indirect RAM to accumulator
Add immediate data to accumulator
Add register to accumulator with carry flag
Add direct byte to A with carry flag
Add indirect RAM to A with carry flag
Add immediate data to A with carry flag
Subtract register from A with borrow
Subtract direct byte from A with borrow
Subtract indirect RAM from A with borrow
Subtract immediate data from A with borrow
Increment accumulator
Increment register
Increment direct byte
Increment indirect RAM
Decrement accumulator
Decrement register
Decrement direct byte
Decrement indirect RAM
Increment data pointer
Multiply A and B
Divide A by B
Decimal adjust accumulator
Code
0x28-0x2F
0x25
0x26-0x27
0x24
0x38-0x3F
0x35
0x36-0x37
0x34
0x98-0x9F
0x95
0x96-0x97
0x94
0x04
0x08-0x0F
0x05
0x06-0x07
0x14
0x18-0x1F
0x15
0x16-0x17
0xA3
0xA4
0x84
0xD4
Bytes Cycles
1
2
2
3
1
3
2
2
1
2
2
3
1
3
2
2
1
2
2
3
1
3
2
2
1
2
1
3
2
4
1
4
1
2
1
3
1
4
2
4
1
1
1
4
1
5
1
4
Table 3. Arithmetic operations
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