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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STM8S 데이터시트(PDF) 25 Page - STMicroelectronics |
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STM8S 데이터시트(HTML) 25 Page - STMicroelectronics |
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25 / 467 page  DocID14587 Rev 14 25/467 RM0016 Central processing unit (CPU) 28 Figure 2. Stacking order Condition code register (CC) The condition code register is an 8-bit register which indicates the result of the instruction just executed as well as the state of the processor. The 6th bit (MSB) of this register is reserved. These bits can be individually tested by a program and specified action taken as a result of their state. The following paragraphs describe each bit: • V: Overflow When set, V indicates that an overflow occurred during the last signed arithmetic operation, on the MSB result bit. See the INC, INCW, DEC, DECW, NEG, NEGW, ADD, ADDW, ADC, SUB, SUBW, SBC, CP, and CPW instructions. • I1: Interrupt mask level 1 The I1 flag works in conjunction with the I0 flag to define the current interruptability level as shown in Table 1. These flags can be set and cleared by software through the RIM, SIM, HALT, WFI, IRET, TRAP, and POP instructions and are automatically set by hardware when entering an interrupt service routine. |
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