题目内容

Mode 0 of. 82c55 is unconditional input and output mode.

A. 对
B. 错

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82c55 is a programmable chip.

A. 对
B. 错

82c55 has three state buffer, so it can be directly linked to the data bus of the system.

A. 对
B. 错

The PB port of 82c55 can be set to mode 2.

A. 对
B. 错

The extended I / O occupies the address resources of the off chip data memory.

A. 对
B. 错