使定时器T0的工作模式1的溢出周期最长的初值是()
A. 0000H
B. 0001H
C. 0FFFEH
D. 0FFFFH
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定时器T0的工作方式3是()
A. 8位计数器结构
B. 2个8位计数器结构
C. 13位计数器结构
D. 16位计数器结构
8051串行口工作在方式1,波特率为2400 bits/s,则每秒钟最多可传送()个字节的数据。
A. 240
B. 300
C. 400
D. 2400
The contents of RAM location 20H and CY are 00H and 1. After execution of following 2 instructions “ORL C, 00H” and “MOV 00H, C”, the contents of internal RAM address 20H will be ( )
A. 00H
B. 01H
C. 20H
D. FFH
Which of the following SFRs is bit-addressable? ( )
A. SP
B. P2
C. TMOD
D. SBUF