Mitsubishi Electronics FX3G User Manual

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3GC

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3UC

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Programming Manual - Basic & Applied Instruction Edition

11 Rotation and Shift Operation – FNC 30 to FNC 39

11.4 FNC 33 – RCL / Rotation Left with Carry

2. 32-bit operation (DRCL and DRCLP)

"n" bits out of 32 bits of [

+1,

] and 1 bit (carry flag M8022) are rotated leftward.

Related device

→ For the carry flag use method, refer to Subsection 6.5.2.

Cautions

• In the case of continuous operation type instructions (RCL and DRCL)

Note that shift and rotation are executed every scan time (operation cycle).

• When a device with digit specification is specified as

Only K4 (16-bit instruction) or K8 (32-bit instruction) is valid (examples: K4Y010 or K8M0).

• Note that the 32-bit value [n+1, n] is valid when D or R is specified as "n" in a 32-bit instruction.

In the case of "DRCL D100 R0", "n" is [R1, R0].

Device

Name

Description

M8022

Carry

Turns ON when the bit shifted last from the highest position is "1".

Command

input

FNC 33
DRCLP

Carry flag

When M8022

is ON

1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1

Low order

b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

After the

instruction is

executed once

High order

1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1

b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16

Before shift b27 to b0

High order

1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0

Low order

Leftward

rotation

b15b14b13b12b11b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

1 1 1

1 1 1 1 0 0 0 0 0 0 0 0

b31b30b29b28b27b26b25b24b23b22b21b20b19b18b17b16

Before shift

b31 to b29

b31 to b29 (32

−n+1) and the head

bit indicating the carry flag ON/OFF
status are moved.

The status

of the final

bit b28 (bit

"32

−n") is

stored.

"n" bits (in the case of K4)

b31 to b28

(b32

−n)

are

moved.

Before shift

Carry flag M8022

Before shift b28

Before

execution

After

execution