M25P20
5
Memory organization
Memory organization
The memory is organized as:
● 262,144 bytes (8 bits each)
● 4 sectors (512 Kbits, 65536 bytes each)
● 1024 pages (256 bytes each).
Each page can be individually programmed (bits are programmed from 1 to 0). The device is
Sector or Bulk Erasable (bits are erased from 0 to 1) but not Page Erasable.
Table 3. Memory Organization
Sector
3
30000h
2
20000h
1
10000h
0
00000h
Address Range
3FFFFh
2FFFFh
1FFFFh
0FFFFh
Figure 6. Block Diagram
HOLD
W
S
C
D
Q
Control Logic
High Voltage
Generator
I/O Shift Register
Address Register
and Counter
256 Byte
Data Buffer
Status
Register
3FFFFh
30000h
20000h
Size of the
read-only
memory area
10000h
00000h
256 Bytes (Page Size)
000FFh
X Decoder
AI04079
15/50