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PM0223 Datasheet(PDF) 55 Page - STMicroelectronics |
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PM0223 Datasheet(HTML) 55 Page - STMicroelectronics |
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55 / 110 page ![]() DocID025763 Rev 1 55/110 PM0223 The STM32L0 Cortex-M0+ Instruction Set 80 . Examples Example 1: shows two instructions that add a 64-bit integer contained in R0 and R1 to another 64-bit integer contained in R2 and R3, and place the result in R0 and R1. Example 1: 64-bit addition ADDS R0, R0, R2 ; add the least significant words ADCS R1, R1, R3 ; add the most significant words with carry Multiword values do not have to use consecutive registers. Example 2: shows instructions that subtract a 96-bit integer contained in R1, R2, and R3 from another contained in R4, R5, and R6. The example stores the result in R4, R5, and R6. Example 2: 96-bit subtraction SUBS R4, R4, R1 ; subtract the least significant words SBCS R5, R5, R2 ; subtract the middle words with carry SBCS R6, R6, R3 ; subtract the most significant words with carry Example 3: shows the RSBS instruction used to perform a 1's complement of a single register. Example 3: Arithmetic negation RSBS R7, R7, #0 ; subtract R7 from zero Table 21. ADC, ADD, RSB, SBC and SUB operand restrictions Instruction Rd Rn Rm imm Restrictions ADCS R0-R7 R0-R7 R0-R7 - Rd and Rn must specify the same register. ADD R0-R15 R0-R15 R0-PC - Rd and Rn must specify the same register. Rn and Rm must not both specify PC. R0-R7 SP or PC - 0-1020 Immediate value must be an integer multiple of four. SP SP - 0-508 Immediate value must be an integer multiple of four. ADDS R0-R7 R0-R7 - 0-7 - R0-R7 R0-R7 - 0-255 Rd and Rn must specify the same register. R0-R7 R0-R7 R0-R7 - - RSBS R0-R7 R0-R7 - - - SBCS R0-R7 R0-R7 R0-R7 - Rd and Rn must specify the same register. SUB SP SP - 0-508 Immediate value must be an integer multiple of four. SUBS R0-R7 R0-R7 - 0-7 - R0-R7 R0-R7 - 0-255 Rd and Rn must specify the same register. R0-R7 R0-R7 R0-R7 - - |
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