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ST7LITE49M データシート(PDF) 136 Page - STMicroelectronics |
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ST7LITE49M データシート(HTML) 136 Page - STMicroelectronics |
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136 / 188 page  Instruction set ST7LITE49M 136/188 Indexed mode (Long) The offset is a word, thus allowing 64 Kbyte addressing space and requires 2 bytes after the opcode. 12.1.5 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. 12.1.6 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 61. 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 |
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