EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 48
EMS6500
Manufacturer Part Number
EMS6500
Description
Microcontroller Development System 4-bit (Emmon), Simulators 4-bit
Manufacturer
EM Microelectronic
Datasheet
1.EMS6500.pdf
(143 pages)
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Assembler Syntax
ADD Reg
INC
SUB Reg
DEC Reg
Copyright 2003, EM Microelectronic-Marin SA
3.2.4. Arithmetic Operations
3.2.4.1. Direct arithmetic operations
Reg
The basic arithmetic operations (INC, DEC, ADD and SUB) can be direct, indexed,
direct with shift right or indexed with shift right. When the instruction is combined
with a shift right it is performed according to the following principal.
Cy
Cy
Cy
Function
Accu = IO(Reg) + Accu
Accu = IO(Reg) + 1
Accu = IO(Reg) - Accu
Accu = IO(Reg) - 1
Fig. 27 Principal of arithmetic operations followed by shift right
3
3
3
Accu
2
2
2
1
1
1
0
0
Operator
0
40
Shift right
3
Register
State Z
2
Development System
z
z
z
z
1
0
if (Accu >15) c = 1
if (Accu >15) c = 1
if(Accu>=0) c=1
if(Accu>=0) c=1
www.emmicroelectronic.com
State Cy
EM66xx
Binder 4.3-01/03 Rev. B/495
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