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Assembly Language
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List the operation modes of 8255

a) I.O Mode

i. Mode 0-Simple Input/Output.
ii. Mode 1-Strobed Input/Output (Handshake mode)
iii. Mode 2-Strobed bidirectional mode

b) Bit Set/Reset Mode.
Posted By:Callum Evans      Posted On: Nov 20

Assembly Language
Comments: 0

What is a control word?

It is a word stored in a register (control register) used to control the operation of a program digital device.
Posted By:Lurlina Fischer      Posted On: May 06

Assembly Language
Comments: 0

What is the purpose of control word written to control register in 8255?

The control words written to control register specify an I/O function for each I.O port. The bit D7 of the control word determines either the I/O function of the BSR function.
Posted By:Harley Evans      Posted On: Aug 07

Assembly Language
Comments: 0

What is the size of ports in 8255?

Port-A : 8-bits
Port-B : 8-bits
Port-CU : 4-bits
Port-CL : 4-bits
Posted By:Georgia Hughes      Posted On: Oct 27

Assembly Language
Comments: 0

Distinguish between the memories mapped I/O peripheral I/O?

Memory Mapped I/O

- 16-bit device address
- Data transfer between any general-purpose register and I/O port.
- The memory map (64K) is shared between I/O device and system memory.
- More hardware is required to decode 16-bit address
- Ari...
Posted By:Maisie Hughes      Posted On: Oct 03

Assembly Language
Comments: 0

What is memory mapping?

The assignment of memory addresses to various registers in a memory chip is called as memory mapping.
Posted By:Lois Schmidt      Posted On: Apr 06

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