5 Categories and Use of Basic Application InstructionsDVP-PM Operation Instruction5-58API Mnemonic Operands Function39 SFRD P Shift Register ReadControllers20PM 10PMBit Devices Word devices Program StepsTypeOP X Y M S K H KnX KnY KnM KnS T C D E FS * * * * * * * *D * * * * * * * *n * *SFRD, SFRDP: 7 stepsOperands:S: Head address of data stack D: Destination device n: Length of data stackExplanation:1. This instruction defines the data stack of n words starting from S as a FIFO data stack and specifies the firstdevice as the pointer (S). The content of pointer indicates current length of the stack. When SFRDP isexecuted, first data (S+1) will be read out to D, all data in this stack moves up to fill the read device and contentin pointer minuses 1. When the content in pointer = 0, the instruction stops and carry flag M1970= ON2. This instruction is generally used in pulse execution mode (SFRDP).3. When SFRD is used as 16-bit instruction, Z device cannot be adopted; when SFRD is used as 32-bitinstruction, V device cannot be adopted.4. When specifying the bit device of KnX(Y/M/S), the starting No. should be a multiple of 16 in octal or decimalformat. For example, K1X0, K4Y20 (octal); K1M0, K4S16 (decimal).5. Valid range of operand n: 2≤ n ≤5126. Flags:OX O100Zero flag M1808 M1968Program Example:1. When X0 goes from OFF to ON, D9~D2 are all shifted to the right and the pointer D0 is decremented by 1when 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.D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D21X0SFRDP D0 K10D21n = 10 pointsData readPointer
