This document distinguishes between memory input/output (IO) and peripheral IO for the 8085 microprocessor. Memory IO uses 16-bit addresses and MEMR/MEMW control signals to access up to 64k IO devices, allowing data transfer between registers and devices. Peripheral IO uses 8-bit addresses and IOR/IOW control signals to access up to 256 IO devices, allowing data transfer between the accumulator and devices. Memory IO instructions include LDA, STA, LDAX, and STAX while peripheral IO instructions are IN and OUT. Memory IO execution is faster at 13 and 7 T-states for LDA/STA and MOV versus 10 T-states for peripheral IO instructions.

1. Distinguish between Memory
IO and Peripheral IO
MADE BY:-
KUNJ GOSAI(150050107033)

2.  An interface is a concept that refers to a point of
interaction between components and is
applicable at the level of Software and Hardware
.
 There are 2 ways to interface 8085 with IO
devices :
1. Memory Mapped IO
2. Peripheral Mapped IO
Introduction

3.  16 bit Addresses (A0-A15)
 MEMR and MEMW control signals are used to control
read and write I/O operations
 More hardware is used to decode 16 bit address
 Contains 2^16(64k) I/O devices
 Data transfer is between any register and I/O device
 Instructions available are LDA addr ; STA addr ; LDAX
rp ; STAX rp ; MOV M,R ; MOV R,M ; etc.
 Execution speed using LDA addr and STA addr is 13
T-state and 7 T-states for MOV M,r and MOV r,M
instructions.
Memory IO

4.  8 bit Addresses (A0-A7 or A8-A15)
 IOR and IOW control signals are used to control
read and write I/O operations
 less hardware is used to decode 8 bit address
 Contains 2^8(256) I/O devices
 Data transfer is between accumulator and I/O
device
 Instructions available are IN and OUT
 Execution speed is 10 T-states.
Peripheral IO

5. THANKS
Info :
Kunj Gosai
150050107033
MI ALA
Topic: Memory and Peripheral IO