Omron C200HX ユーザーズマニュアル

DIFU(13) and DIFD(14) operation can be uncertain when the instructions are
programmed between IL and ILC, between JMP and JME, or in subroutines. Re-
fer to 5-10 INTERLOCK and INTERLOCK CLEAR – IL(02) and ILC(03), 5-11
JUMP and JUMP END – JMP(04) and JME(05), and 5-23 Subroutines and Inter-
rupt Control for details.

In diagram A, below, whenever CMP(20) is executed with an ON execution
condition it will compare the contents of the two operand words (HR 10 and DM
0000) and set the arithmetic flags (GR, EQ, and LE) accordingly. If the execution
condition remains ON, flag status may be changed each cycle if the content of
one or both operands change. Diagram B, however, is an example of how
DIFU(13) can be used to ensure that CMP(20) is executed only once each time
the desired execution condition goes ON.

00000

CMP(20)

HR 10

DM 0000

22500

CMP(20)

HR 10

DM 0000

DIFU(13) 22500

00000

00000

LD

00000

00001

CMP(20)

HR

10

DM

0000

00000

LD

00000

00001

DIFU(13)

22500

00002

LD

22500

00003

CMP(20)

HR

10

DM

0000

Although a differentiated form of MOV(21) is available, the following diagram
would be very complicated to draw using it because only one of the conditions
determining the execution condition for MOV(21) requires differentiated treat-
ment.

22500

MOV(21)

HR 10

DM 0000

DIFU(13) 22500

00000

00001

00002

00003

00004

00005

00000

LD

00000

00001

DIFU(13)

22500

00002

LD

22500

00003

LD

00001

00004

AND NOT

00002

00005

AND NOT

00003

00006

OR LD

---

00007

LD 00004

00008

AND NOT

00005

00009

OR LD

---

00010

MOV(21)

HR

10

DM

0000