In order to measure the width of the positive single pulse on the pin, the content of the special function register TMOD should be ().
A. 87H
B. 09H
C. 80H
D. 00H
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When timer T1 of 8051 single chip microcomputer is used as timing mode, it is.
A. Timing by internal clock frequency, one clock cycle plus 1
B. Fixed by the internal clock frequency, a machine cycle plus 1
C. Timing by external clock frequency, one clock cycle plus 1
D. By external clock frequency timing, a machine cycle plus 1
When the timer T0 of 8051 single chip microcomputer is used as counting mode, it is.
A. Timing by internal clock frequency, one clock cycle plus 1
B. Fixed by the internal clock frequency, a machine cycle plus 1
Counting by external counting pulse, falling edge plus 1
D. Counting by external counting pulse, one machine cycle plus 1
The timer T1 of 8051 single chip microcomputer is used as counting mode, and the counting pulse is.
A. Input from T1 (p3.5)
B. Provided by internal clock frequency
C. Input from t0 (p3.4)
D. Counting by external counting pulse
When the timer T1 of 8051 is used as timing mode and mode 1 is used, the control word of working mode is ().
A. 01H
B. 05H
C. 10H
D. 50H
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