The number of operation modes of 8051 timers is ______ . When Timer 0 is configured in mode ______ , it works as two independent ______ -bit timers.
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Which of the following DAC provides the best resolution? ()
A. 4-bit DAC
B. 8-bit DAC
C. 10-bit DAC
D. 12-bit DAC
For 8051 level-triggered external interrupt, once the ISR is started, the source of the interrupt has to be disabled by external device. ( )
In the 8051, there can be two separate data memories from address 00H to 7FH. ( )
Which ports of MCS-51 send out address signals to externally interfaced memory devices? ()
A. Ports 0 and 1
B. Ports 1 and 3
C. Ports 0 and 2
D. Ports 0 and 3