题目内容

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

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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. ( )

It is impossible for 8051 to write data to receiving SBUF. ( )

The number of interrupt vectors of 8051 is ______ .

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