Part I. CLOSE BOOK: Answer directly on the exam sheet. A. True or false. If your answer is false, please explain your reasons. (2096) 1. 8051 has only three hardware interrupt input pins, which are INTO, INT1 and INT 2. 2. "Bit D7 of the IE register (EA) must be set to high" means to enable all 8051 interrupts. 3. There is only a single interrupt in the interrupt vector table of 8051 assigned to both Timer 0 and Timer1 4. The last instruction of an 8051 interrupt service routine should always be RET. 5. )All 8051 C compilers do not support bit-wise operators (operations) 6. 8051 does not have shift instructions. 8051 use rotate instructions to replace shift instructions. 7. The SWAP instruction of 8051 is to exchange the content of a register and a memorv location. 8. DA instruction should be used directly after a multiplication instruction. 9. 8051 has a trap especially for divide-by-zero. 10. We will use OR instructions to mask some Input/output signals. Part I. CLOSE BOOK: Answer directly on the exam sheet. A. True or false. If your answer is false, please explain your reasons. (2096) 1. 8051 has only three hardware interrupt input pins, which are INTO, INT1 and INT 2. 2. "Bit D7 of the IE register (EA) must be set to high" means to enable all 8051 interrupts. 3. There is only a single interrupt in the interrupt vector table of 8051 assigned to both Timer 0 and Timer1 4. The last instruction of an 8051 interrupt service routine should always be RET. 5. )All 8051 C compilers do not support bit-wise operators (operations) 6. 8051 does not have shift instructions. 8051 use rotate instructions to replace shift instructions. 7. The SWAP instruction of 8051 is to exchange the content of a register and a memorv location. 8. DA instruction should be used directly after a multiplication instruction. 9. 8051 has a trap especially for divide-by-zero. 10. We will use OR instructions to mask some Input/output signals