Statement List (STL) - DCE FEL ČVUT v Praze

Shift and Rotate Instructions
11.1.2 SSI Shift Sign Integer (16-Bit)
Formate
Description
Status word
Examples
SSI
SSI
Address Data type Description
integer, unsigned number of bit positions to be shifted, range
from 0 to 15
SSI (shift right with sign integer) shifts only the contents of ACCU 1- L to the right bit
by bit. The bit places that are vacated by the shift instruction are filled with the signal
state of the sign bit (bit 15). The bit that is shifted out last is loaded into the status
word bit CC 1. The number of bit positions to be shifted is specified either by the
address or by a value in ACCU 2-L-L.
SSI : The number of shifts is specified by the address . The
permissible value range is from 0 to 15. The CC 0 and OV status word bits are reset
to 0 if is greater than zero. If is equal to zero, the shift
instruction is regarded as a NOP operation.
SSI: The number of shifts is specified by the value in ACCU 2- L- L. The possible
value range is from 0 to 255. A shift number >16 always produces the same result
(ACCU 1 = 16#0000, CC 1 = 0, or ACCU 1 = 16#FFFF, CC 1 = 1). If the shift number
is greater than 0, the status word bits CC 0 and OV are reset to 0. If the shift number
is zero, then the shift instruction is regarded as a NOP operation.
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - x x x - - - - -
Contents ACCU1-H ACCU1-L
Bit 31 . . . . . . . . . . 16 15 . . . . . . . . . . 0
before execution of SSI 6 0101 1111 0110 0100 1001 1101 0011 1011
after execution of SSI 6 0101 1111 0110 0100 1111 1110 0111 0100
Statement List (STL) for S7-300 and S7-400 Programming
11-2 A5E00706960-01