The memory used in embedded systems can be either internal or external. The internal
memory of a processor is very limited. For small applications, if this memory is sufficient,

there is need to used external memory.

Memory
‏سس‎ Secondary
ಗಾರ ‏نع‎ 1
ROM RAM
5٢ 2 8 Disk drive Tape Drives
PROM | Static an
‏علللللتا‎
‎ത്ന: Ram Dyn | CD Rom
EEPROM Cache Hard “|
Floppy
Read Only Read Write
| Random Access Memory
− ↕↸↹∶⋮⇂∹⇃−⊙∏∣⋝∣ Memory
| Hybrid Memory
‏لا‎ Random Access Memory

It’s a type of memory that can be accessed randomly - that is, a memory location can be
accessed without touching other locations. RAM is also called Read-Write Memory, as you
can perform both read and write operations on this memory device. RAM is of two types
005913116 RAM: Retains its contents as long as electrical power is being supplied to the
device. For Example: The desktop PC contains SRAM, which loses data when power is
switched.

000۷٦3۲۱١ RAM: DRAM has sort life cycle, typically one fourth of second, even if power
is being supplied. Its uses DRAM controller in conjunction with DRAM to refresh the
memory periodically they generally have low costs. A handheld computer contains DRAM

to store data.

O Read Only Memory

It is a memory device from which the processor can read data but to which it cannot write
data. Like CD. The programs and data that need to be permanently stored are kept in ROM

devices. ROM Retains its contents even if power is switched off; therefore it is used to store