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PM0044 数据表(PDF) 78 Page - STMicroelectronics |
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PM0044 数据表(HTML) 78 Page - STMicroelectronics |
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78 / 162 page ![]() STM8 instruction set PM0044 78/162 Doc ID 13590 Rev 3 Syntax ADDW dst,src e.g. ADDW X,#$1000 Operation dst <= dst + src Description The source (16-bit) is added to the contents of the destination, which is an index register (X/Y) and the result is stored in the same index register. The source is a 16-bit memory or data word. The ADDW instruction can also be used to add an immediate value to the stack pointer (SP). Instruction overview V ⇒ (A15.M15 + M15.R15 + R15.A15) ⊕ (A14.M14 + M14.R14 + R14.A14) Set if the signed operation generates an overflow, cleared otherwise. H ⇒ X7.M7 + M7.R7 + R7.X7 Set if a carry occurred from bit 7 of the result, cleared otherwise. N ⇒ R15 Set if bit 15 of the result is set (negative value), cleared otherwise. Z ⇒ R15.R14.R13.R12.R11.R10.R9.R8.R7.R6.R5.R4.R3.R2.R1.R0 Set if the result is zero (0x0000), cleared otherwise. C ⇒ X15.M15 + M15.R15 + R15.X15 Set if a carry occurred from bit 15 of the result, cleared otherwise. Detailed description See also: ADD, ADC, SUB, SBC, MUL, DIV ADDW Word Addition with index registers ADDW mnem dst src Affected condition flags VI1 H I0 N Z C ADDW X Mem V - H - N Z C ADDW Y Mem V - H - N Z C ADDW SP Imm ------- dst src Asm cy lgth Op-code(s) ST7 X #word ADDW X,#$1000 2 3 1C MS LS X longmem ADDW X,$1000 2 4 72 BB MS LS X (shortoff,SP) ADDW X,($10,SP) 2 3 72 FB XX Y #word ADDW Y,#$1000 2 4 72 A9 MS LS Y longmem ADDW Y,$1000 2 4 72 B9 MS LS Y (shortoff,SP) ADDW Y,($10,SP) 2 3 72 F9 XX SP #byte ADDW SP,#$9 2 2 5B XX |
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