The trigger mode selection bits of external interrupt 1 and external interrupt 0 of MCS-51 single chip microcomputer are ().
A. Tr1 and tr0
B. IE1 and ie0
C. It1 and it0
D. TF1 and TF0
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There are five interrupt sources in 8051 single chip microcomputer. In the same level, when five interrupt sources send interrupt requests at the same time, the content of program counter PC becomes ().
A. 000BH
B. 0003H
C. 0013H
D. 001BH
The process of MCS-51 MCU responding to interrupt is ().
A. The breakpoint PC automatically presses the stack and loads the corresponding interrupt vector address into the PC
B. Turn off the interrupt and the program goes to the interrupt service program
C. The PC points to the interrupt service program address
D. The breakpoint PC automatically presses the stack, loads the corresponding interrupt vector address into the PC, and the program turns to the vector address
MCS-51 response interrupt vector address is.
A. The first address of the interrupt service program
B. Exit address of interrupt service program
C. The entry address of the interrupt service program
D. The address of the main program waiting for interrupt instruction
When the serial port of MCS-51 MCU receives or transmits a frame of data, the () in scon is applied to CPU for interrupt.
A. RI or ti set to 1
B. RI or ti set to 0
C. RI set to 1 or ti set to 0
D. RI set to 0 or ti set to 1
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