题目内容

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

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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

Bit-addressable locations of the 8051 include( )

A. 16 internal RAM bytes
B. majority of SFRs
C. I/O ports
D. 16 internal RAM bytes, I/O ports and majority of SFRs

The 8051 has bit-level instructions for ( )

AND
B. OR
C. complement
D. AND, OR and complement

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