Calculating With Signed Binary Data - Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual

Calculating with Signed Binary Data

Application Example
Macro not used
00000 20001
20000
00001 00002
00200 20501
20500
00201 00202
00500 21001
21000
00501 00502
01000 22001
22000
00101 00102

2-16 Calculating with Signed Binary Data

CPM2A/CPM2C and
SRM1(-V2) Instructions
CPM1/CPM1A Instructions
Signed Data Calculations
158
When a macro is used, the program can be simplified as shown below.
20000
20001
20500
20501
21000
21001
22000
Subroutine used
22001
to define macro
The CPM1/CPM1A/CPM2A/SRM1(-V2) allow calculations on signed binary
data. The following instructions manipulate signed binary data. Signed data is
handled using 2's complements.
The following signed-binary instructions are available in CPM2A, CPM2C, and
SRM1(-V2) PCs:
BINARY ADD – ADB(50)
BINARY SUBTRACT – SBB(51)
2'S COMPLEMENT – NEG(––)
The following signed-binary instructions are available in CPM1/CPM1A PCs:
BINARY ADD – ADB(50)
BINARY SUBTRACT – SBB(51)
Addition
7 + 3 = 10
(–7) + 3 = –4
7 + (–3) = 4
(–7) + (–3) = –10
Section
Macro used
25313 (Always ON)
MCRO(99)
MCRO(99)
MCRO(99)
MCRO(99)
SBN(92)
23200 23601
23600
23201 23202
RET(93)
Subtraction
7 – 3 = 4
(–7) – 3 = –10
7 – (–3) = 10
(–7) – (–3) = –4
2-16
030
000
200
030
002
205
030
005
210
030
010
220
030
23600
23201