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ST7LITE0X Datasheet(PDF) 76 Page - STMicroelectronics |
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ST7LITE0X Datasheet(HTML) 76 Page - STMicroelectronics |
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76 / 125 page  ST7LITE0x, ST7LITESx 76/125 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 subdi- vided in two submodes called long and short: – Long addressing mode is more powerful be- cause it can use the full 64 Kbyte address space, however it uses more bytes and more CPU cy- cles. – Short addressing mode is less powerful because it can generally only access page zero (0000h - 00FFh range), but the instruction size is more compact, and faster. All memory to memory in- structions 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 18. ST7 Addressing Mode Overview Note: 1. At the time the instruction is executed, the Program Counter (PC) points to the instruction following JRxx. 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 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 Short Indirect Indexed ld A,([$10],X) 00..1FE 00..FF byte + 2 Long Indirect Indexed ld A,([$10.w],X) 0000..FFFF 00..FF word + 2 Relative Direct jrne loop PC-128/PC+1271) + 1 Relative Indirect jrne [$10] PC-128/PC+1271) 00..FF byte + 2 Bit Direct bset $10,#7 00..FF + 1 Bit Indirect bset [$10],#7 00..FF 00..FF byte + 2 Bit Direct Relative btjt $10,#7,skip 00..FF + 2 Bit Indirect Relative btjt [$10],#7,skip 00..FF 00..FF byte + 3 1 |
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