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L9805 Datasheet(PDF) 86 Page - STMicroelectronics |
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L9805 Datasheet(HTML) 86 Page - STMicroelectronics |
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86 / 103 page  86/103 L9805 6 INSTRUCTION SET 6.1 ST7 ADDRESSING MODES The ST7 Core features 17 different addressing modes which can be classified in 7 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 sub-modes called long and short: – Long addressing mode is more powerful be- cause it can use the full 64Kbyte 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 (0000 - 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 optimize the use of long and short addressing modes. Table 13. ST7 Addressing Mode Overview: 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 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 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+/-127 + 1 Relative Indirect jrne [$10] PC+/-127 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 |
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