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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST7LITEUS2 Scheda tecnica(PDF) 87 Page - STMicroelectronics |
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ST7LITEUS2 Scheda tecnica(HTML) 87 Page - STMicroelectronics |
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87 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) ST7LITEUS2, ST7LITEUS5 Instruction set 87/136 11.1.5 Indirect modes (short, long) The required data byte to do the operation is found by its memory address, located in memory (pointer). The pointer address follows the opcode. The indirect addressing mode consists of two submodes: Indirect mode (short) The pointer address is a byte, the pointer size is a byte, thus allowing 00 - FF addressing space, and requires 1 byte after the opcode. Indirect mode (long) The pointer address is a byte, the pointer size is a word, thus allowing 64 Kbyte addressing space, and requires 1 byte after the opcode. 11.1.6 Indirect indexed modes (short, long) This is a combination of indirect and short indexed addressing modes. The operand is referenced by its memory address, which is defined by the unsigned addition of an index register value (X or Y) with a pointer value located in memory. The pointer address follows the opcode. The indirect indexed addressing mode consists of two submodes: Indirect indexed mode (short) The pointer address is a byte, the pointer size is a byte, thus allowing 00 - 1FE addressing space, and requires 1 byte after the opcode. Indirect indexed mode (long) The pointer address is a byte, the pointer size is a word, thus allowing 64 Kbyte addressing space, and requires 1 byte after the opcode. Table 39. Instructions supporting direct, indexed, indirect and indirect indexed addressing modes Instructions Function Long and short instructions LD Load CP Compare AND, OR, XOR Logical operations ADC, ADD, SUB, SBC Arithmetic addition/subtraction operations BCP Bit compare Short instructions only CLR Clear INC, DEC Increment/decrement TNZ Test negative or zero Obsolete Product(s) - Obsolete Product(s) |
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