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ST7LITE20F2 数据表(PDF) 110 Page - STMicroelectronics |
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ST7LITE20F2 数据表(HTML) 110 Page - STMicroelectronics |
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110 / 166 page  Instruction set ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 110/166 Doc ID 8349 Rev 5 12 Instruction set 12.1 ST7 addressing modes The ST7 Core features 17 different addressing modes which can be classified in seven main groups: : The ST7 Instruction set is designed to minimize the number of bytes required per instruction: To do so, most of the addressing modes may be subdivided in two submodes called long and short: ● Long addressing mode is more powerful because it can use the full 64 Kbyte address space, however it uses more bytes and more CPU cycles. ● Short addressing mode is less powerful because it can generally only access page zero (0000h00FFh range), but the instruction size is more compact, and faster. All memory to memory instructions use short addressing modes only (CLR, CPL, NEG, BSET, BRES, BTJT, BTJF, INC, DEC, RLC, RRC, SLL, SRL, SRA, SWAP). The ST7 Assembler optimizes the use of long and short addressing modes. Table 48. Addressing mode groups Addressing mode Example Inherent nop Immediate ld A,#$55 Direct ld A,$55 Indexed ld A,($55,X) Indirect ld A,([$55],X) Relative jrne loop Bit operation bset byte,#5 Table 49. ST7 addressing mode overview Mode Syntax Destination/ source Pointer address (Hex.) Pointer size (Hex.) Length (bytes) Inherent −− nop −− − + 0 Immediate −− ld A,#$55 −− − + 1 Short Direct − ld A,$10 00..FF −− + 1 Long Direct − ld A,$1000 0000..FFFF −− + 2 No offset Direct Indexed ld A,(X) 00..FF −− + 0 (with x register) + 1 (with Y register) Short Direct Indexed ld A,($10,X) 00..1FE −− + 1 Long Direct Indexed ld A,($1000,X) 0000..FFFF −− + 2 Short Indirect − ld A,[$10] 00..FF 00..FF byte + 2 Long Indirect − ld A,[$10.w] 0000..FFFF 00..FF word + 2 |
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