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ST7285C Datasheet(PDF) 81 Page - STMicroelectronics |
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ST7285C Datasheet(HTML) 81 Page - STMicroelectronics |
81 / 117 page 81/117 ST7285C ST7 ADDRESSING MODES(Cont’d) Indexed (no offset, short, long) The required data byte to do the operation is found by its memory address, which is defined by the un- signed addition of an index register (X or Y) with an offset which follows the op-code. The indirect addressing mode consists of three sub-modes: Indexed (no offset): There is no offset, (no extra byte after the op- code), but only allows 00 - FF addressing space. Indexed (short): The offset is a byte, thus require only one byte af- ter the op-code, but only allow 00 - 1FE address- ing space. Indexed (long): The offset is a word, thus allowing 64Kb address- ing space, but requires 2 bytes after the op-code. Indirect (short, long): The required data byte to do the operation is found by its memory address, located in memory (point- er). The pointer address follows the op-code. The indi- rect addressing mode consists of two sub-modes: Indirect (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 op-code. Indirect (long): The pointer address is a byte, the pointer size is a word, thus allowing 64Kb addressing space, and requires 1 byte after the op-code. No Offset, Long and Short Indexed Instruc. Function LD Load CP Compare AND, OR, XOR Logical Operations ADC, ADD, SUB, SBC Arithmetic Additions/Sub- stractions operations BCP Bit Compare No Offset and Short Indexed Inst. Only Function CLR Clear INC, DEC Increment/Decrement TNZ Test Negative or Zero CPL, NEG 1 or 2 Complement BSET, BRES Bit Operations BTJT, BTJF Bit Test and Jump Operations SLL, SRL, SRA, RLC, RRC Shift and Rotate Operations SWAP Swap Nibbles CALL, JP Call or Jump subroutine Available Long and Short Indir ect Instructions Function LD Load CP Compare AND, OR, XOR Logical Operations ADC, ADD, SUB, SBC Arithmetic Additions/Sub- stractions operations BCP Bit Compare Short Indirect Instructions Only Fun ction CLR Clear INC, DEC Increment/Decrement TNZ Test Negative or Zero CPL, NEG 1 or 2 Complement BSET, BRES Bit Operations BTJT, BTJF Bit Test and Jump Operations SLL, SRL, SRA, RLC, RRC Shift and Rotate Operations SWAP Swap Nibbles CALL, JP Call or Jump subroutine |
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