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ST72324BK bảng dữ liệu(PDF) 130 Page - STMicroelectronics |
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ST72324BK bảng dữ liệu(HTML) 130 Page - STMicroelectronics |
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130 / 188 page ![]() Instruction set ST72324B 130/188 . 11.1.3 Direct In Direct instructions, the operands are referenced by their memory address. The direct addressing mode consists of two submodes: Direct (short) The address is a byte, thus requiring only one byte after the opcode, but only allows 00 - FF addressing space. Direct (long) The address is a word, thus allowing 64 Kbyte addressing space, but requires 2 bytes after the opcode. 11.1.4 Indexed (no offset, short, long) In this mode, the operand is referenced by its memory address, which is defined by the unsigned addition of an index register (X or Y) with an offset. The indexed addressing mode consists of three submodes: Indexed (no offset) There is no offset, (no extra byte after the opcode), and it allows 00 - FF addressing space. Indexed (short) The offset is a byte, thus requiring only one byte after the opcode and allows 00 - 1FE addressing space. Indexed (long) The offset is a word, thus allowing 64 Kbyte addressing space and requires 2 bytes after the opcode. 11.1.5 Indirect (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: Table 77. Immediate instructions Instruction Function LD Load CP Compare BCP Bit Compare AND, OR, XOR Logical operations ADC, ADD, SUB, SBC Arithmetic operations |
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