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
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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
When the it1 and it0 bits in the timer control register TCON are cleared to 0, the external interrupt request signal mode is ().
A. Low level active
B. High level active
C. Pulse up bound valid
D. Pulse negative jump valid
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