2.6.11 I0 to IE Index registers
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How index registers work
● Index registers are used to indirectly specify constants and memory area addresses.
● Depending on the values of the index register, changes to addresses and constants are
called "index modification".
● Fifteen 32-bit registers are available for I0 to IE.
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Notes on using index registers
● When the result of an address modifier exceeds the range for the memory area, an operation
error occurs.
Example) When the result of the modifier is an address with a negative value or value that is
too large
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Values that can be modified with index registers
● Number of the memory area used for a basic instruction
● Slot number or memory area number
● Number of the memory area used for a high-level instruction
● Value of the constant specified for a high-level instruction
● K constant (16-bit, 32-bit)
● U constant (16-bit, 32-bit)
● H constant (16-bit, 32-bit)
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Value that cannot be modified with index registers
● Floating point data
● Depending on the instruction, index modification cannot be applied to some operands. Refer
to the "Available devices" section of the description page for each instruction.
● An index register (I0 to IE) occupies a 32-bit area.
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How to apply index modification
<Example 1> Modifying a transfer destination
The address in the data register (DT) for the transfer destination varies according to the value
of DT0.
2.6 Description of the memory area
2-36
WUME-FP7CPUPGR-12
Содержание FP7 Series
Страница 2: ... MEMO 2 WUME FP7CPUPGR 12 ...
Страница 18: ... MEMO xviii WUME FP7CPUPGR 12 ...
Страница 52: ... MEMO 1 34 WUME FP7CPUPGR 12 ...
Страница 61: ...Example 2 Use PSHS RDS or POPS instruction 2 1 Structure of Instructions WUME FP7CPUPGR 12 2 9 ...
Страница 104: ... MEMO 2 52 WUME FP7CPUPGR 12 ...
Страница 123: ...3 9 ANS AND stack WUME FP7CPUPGR 12 3 19 ...
Страница 125: ...3 10 ORS OR Stack WUME FP7CPUPGR 12 3 21 ...
Страница 129: ...3 11 PSHS Push stack RDS Read stack POPS Pop stack WUME FP7CPUPGR 12 3 25 ...
Страница 139: ...4 CNDE instruction 5 Step ladder instructions 6 Subroutine instructions 3 16 ALT Alternate out WUME FP7CPUPGR 12 3 35 ...
Страница 146: ... Application example of timer instructions serial connection of timers 3 17 TM Timer 3 42 WUME FP7CPUPGR 12 ...
Страница 147: ... Application example of timer instructions parallel connection of timers 3 17 TM Timer WUME FP7CPUPGR 12 3 43 ...
Страница 190: ...3 26 JP LBL Jump Label 3 86 WUME FP7CPUPGR 12 ...
Страница 239: ...Name Description SR8 ER 3 46 ST ST ST ST ST ST Data Comparison Start WUME FP7CPUPGR 12 3 135 ...
Страница 246: ... MEMO 3 142 WUME FP7CPUPGR 12 ...
Страница 251: ...Name Description SRA Depending on the comparison result SRB SRC 4 1 CMP Data Compare WUME FP7CPUPGR 12 4 5 ...
Страница 258: ... MEMO 4 12 WUME FP7CPUPGR 12 ...
Страница 277: ...F E D C B A 9 8 7 6 5 4 3 2 1 0 Digit 3 Digit 2 Digit 1 Digit 0 bit 5 8 DGT Digit Data Transfer WUME FP7CPUPGR 12 5 19 ...
Страница 304: ... MEMO 5 46 WUME FP7CPUPGR 12 ...
Страница 321: ...Name Description ER 6 7 DIVFP2 Division FP2 Compatible WUME FP7CPUPGR 12 6 17 ...
Страница 348: ... MEMO 6 44 WUME FP7CPUPGR 12 ...
Страница 388: ... MEMO 7 40 WUME FP7CPUPGR 12 ...
Страница 438: ... MEMO 8 50 WUME FP7CPUPGR 12 ...
Страница 450: ... MEMO 9 12 WUME FP7CPUPGR 12 ...
Страница 520: ... MEMO 10 70 WUME FP7CPUPGR 12 ...
Страница 602: ... MEMO 11 82 WUME FP7CPUPGR 12 ...
Страница 622: ... MEMO 12 20 WUME FP7CPUPGR 12 ...
Страница 650: ... MEMO 13 28 WUME FP7CPUPGR 12 ...
Страница 1160: ... MEMO 18 66 WUME FP7CPUPGR 12 ...
Страница 1188: ... MEMO 19 28 WUME FP7CPUPGR 12 ...
Страница 1211: ...20 4 ASCII Code Table JIS8 Code Table Reference Table ASCII Codes 20 4 ASCII Code Table JIS8 Code Table WUME FP7CPUPGR 12 20 23 ...
Страница 1220: ... MEMO WUME FP7CPUPGR 12 ...
Страница 1221: ... MEMO WUME FP7CPUPGR 12 ...