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ST7LITE09 Datasheet(PDF) 74 Page - STMicroelectronics |
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ST7LITE09 Datasheet(HTML) 74 Page - STMicroelectronics |
74 / 122 page ST7LITE0, ST7SUPERLITE 74/122 ST7 ADDRESSING MODES (Cont’d) 12.1.6 Indirect Indexed (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 un- signed addition of an index register value (X or Y) with a pointer value located in memory. The point- er address follows the opcode. The indirect indexed addressing mode consists of two sub-modes: Indirect Indexed (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 (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 19. Instructions Supporting Direct, Indexed, Indirect and Indirect Indexed Addressing Modes 12.1.7 Relative Mode (Direct, Indirect) This addressing mode is used to modify the PC register value by adding an 8-bit signed offset to it. The relative addressing mode consists of two sub- modes: Relative (Direct) The offset follows the opcode. Relative (Indirect) The offset is defined in memory, of which the ad- dress follows the opcode. Long and Short Instructions Function LD Load CP Compare AND, OR, XOR Logical Operations ADC, ADD, SUB, SBC Arithmetic Addition/subtrac- tion operations BCP Bit Compare Short Instructions 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 Opera- tions SLL, SRL, SRA, RLC, RRC Shift and Rotate Operations SWAP Swap Nibbles CALL, JP Call or Jump subroutine Available Relative Direct/ Indirect Instructions Function JRxx Conditional Jump CALLR Call Relative 1 |
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