For 8051 level-triggered external interrupt, once the ISR is started, the source of the interrupt has to be disabled by external device. ( )
查看答案
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
The instruction MOV TMOD, #30H will ().
A. configure Timer 1 as a timer in Mode 2
B. configure Timer 1 as a timer in Mode 3
C. configure Timer 0 as a timer in Mode 2
D. configure Timer 0 as a timer in Mode 3
An alternate function of port pin P3.4 in the 8051 is ()
A. Timer 0 input
B. Timer 1 input
C. Externl interrupt 0 input
D. Externl interrupt 1 input
微信支付 
支付宝支付