Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Sfrd, Shift Register Read

3 . Instruction Set

API

39

Mnemonic		Operands	Function
SFRD	P		Shift Register Read

Controllers

ES2/EX2	SS2	SA2	SX2
		SE

Type

Bit Devices

Word devices

Program Steps

OP

X

Y

M

S

K

H

KnX

KnY

KnM

KnS

T

C

D

E

F

SFRD, SFRDP: 7 steps

S

*

*

*

*

*

*

D

*

*

*

*

*

*

*

*

n

*

*

PULSE

16-bit

32-bit

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

SE

SE

SE

Operands:

S: Head address of data stack

D: Destination device

n: Length of data stack

Explanation:

1.This instruction defines the data stack of n words starting from S as a FIFO data stack and specifies the first device as the pointer (S). The content of pointer indicates current length of the stack. When SFRDP is executed, first data (S+1) will be read out to D, all data in this stack moves up to fill the read device and content in pointer minuses 1. When the content in pointer = 0, the instruction stops and carry flag M1022= ON

2.This instruction is generally used in pulse execution mode (SFRDP).

3.Valid range of operand n: 2≤ n ≤512

Program Example:

1.When X0 goes from OFF to ON, D9~D2 are all shifted to the right and the pointer D0 is decremented by 1 when the content of D1 is read and moved to D21.

2.The figure below illustrates the shift and reading of the instruction. n The content of D1 is read and moved to D21.

o D9~D2 are all shifted to the right.

p The content of D0 is decremented by 1.

X0

SFRDP

D0

D21

K10

n = 10 points

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

D21

Pointer

Data read

3 - 101