DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

3. Instruction Set
API Mnemonic Operands Function
39 SFRD P Shift Register Read
Controllers
ES2/EX2 SS2 SA2
SE
SX2
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
SA2
SX2 ES2/EX2 SS2 SX2 ES2/EX2 SS2
SE
ES2/EX2 SS2 SA2
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.
The content of D1 is read and moved to D21.
D9~D2 are all shifted to the right.
The content of D0 is decremented by 1.
SA2
SE
SX2
X0
SFRDP D0 D21 K10
n = 10 points
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D21
Pointer
Data read
3-101