MICROPROCESSOR AND MICROCONTROLLER

MICROPROCESSOR 8255

ARCHITECTURE OF 8085

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

How many bits of data can be transferred between the 8255 PPI and the interfaced device at a time? or What is the size of internal bus of the 8255 PPI?

A	16 bits
B	12 bits
C	8 bits
D	None of the above

Explanation:

Detailed explanation-1: -Explanation: There are 24 input/output pins for the 8255. These are split into three ports that are 8-bit (A, B, C). It is possible to use Port A and Port B as 8-bit input/output ports.

Detailed explanation-2: -The 8255 has 24 input/output pins. These are divided into three 8-bit ports (A, B, C). Port A and port B can be used as 8-bit input/output ports.

Detailed explanation-3: -Features of 8255A It consists of 3 8-bit IO ports i.e. PA, PB, and PC. Address/data bus must be externally demux’d. It is TTL compatible.

Detailed explanation-4: -Mode 1 – Handshake or Strobed I/O In this mode the Port A and Port B can be used as input or output ports, the port C are used for handshaking. In this mode the inputs and outputs are latched. This mode also has the interrupt handling capability, and signal control to match the speed of CPU and IO devices.

There is 1 question to complete.