第五章测试1.How many interrupt sources are there in 8051 ? （ ）
A:4 B:2 C:3 D:5
答案:D
2.The EA bit in IE register does not actually enable all interrupts, but allows them to be enabled separately. （ ）
A:错 B:对 3.For 8051, each interrupt causes the program to jump directly to an address at which an ISR is located. （ ）
A:错 B:对 4.In an ISR (Interrupt Service Routine), which of the following instructions must be included? （ ）
A:Jump and call instructions
B:Move data instruction C:Return from interrupt instruction
D:ADD instruction 5.
How many interrupts are enabled after running this instruction “MOV IE, #05h”?
A:
2
3
0
1
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