题目内容

In 8051, () interrupt has the lowest natural priority.

A. External 0
B. External 1
C. Timer 0
D. Serial port

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Which of the following instruction will load the value 20H into the low byte of Timer 0? ()

A. MOV TH0, #20H
B. MOV TH0, 20H
C. MOV TL0, #20H
D. MOV TL0, 20H

In which modes of 8051 UART, is the baud rate dependent on Timer 1 overflow rate? ()

A. Mode 1 and Mode 3
B. Mode 2 and Mode 3
C. Mode 0 and Mode 2
D. Mode 0 and Mode 1

Which of the following DAC provides the best resolution? ()

A. 4-bit
B. 8-bit
C. 10-bit
D. 12-bit

If 8051 external interrupt is level activated, the external source must hold request active until the requested interrupt is responded. ( )