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Data Shift Instructions Section 3-9
Description SLD(074) shifts data between St and E by one digit (4 bits) to the left. “0” is
placed in the rightmost digit (bits 3 to 0 of St), and the content of the leftmost
digit (bits 15 to 12 of E) is lost.
Flags
Precautions When St is greater than E, an error will be generated and the Error Flag will
turn ON.
Note When large amounts of data are shifted, the instruction execution time is quite
long. Be sure that the power is not cut while SLD(074) is being executed,
causing the shift operation to stop halfway through.
Examples When CIO 000000 is ON, words CIO 0100 through CIO 0102 will shift by one
digit (4 bits) to the left. A zero will be placed in bits 0 to 3 of word CIO 0100
and the contents of bits 12 to 15 of CIO 0102 will be lost.
EM Area with bank En_00000 to En_32767
(n = 0 to C)
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants ---
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area St E
ESt
Lost
Name Label Operation
Error Flag ER ON when St is greater than E.
OFF in all other cases.
E
St
Lost
E: CIO 0102 St+1: CIO 0101 St: CIO 0100
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