m95512-r STMicroelectronics, m95512-r Datasheet - Page 23

• Manufacturer Part Number: m95512-r
• Description: 512kbit Serial Spi Bus Eeprom With High Speed Clock
• Manufacturer: STMicroelectronics

M95512-W, M95512-R
6.5
Figure 11. Read from Memory Array (READ) sequence
S
C
D
Q
Regardless of the order of the two events, the Hardware Protected Mode (HPM) can be
entered:
The only way to exit the Hardware Protected Mode (HPM) once entered is to pull Write
Protect (W) High.
If Write Protect (W) is permanently tied High, the Hardware Protected Mode (HPM) can
never be activated, and only the Software Protected Mode (SPM), using the Block Protect
(BP1, BP0) bits of the Status Register, can be used.
Read from Memory Array (READ)
As shown in
Low. The bits of the instruction byte and address bytes are then shifted in, on Serial Data
Input (D). The address is loaded into an internal address register, and the byte of data at
that address is shifted out, on Serial Data Output (Q).
If Chip Select (S) continues to be driven Low, the internal address register is automatically
incremented, and the byte of data at the new address is shifted out.
When the highest address is reached, the address counter rolls over to zero, allowing the
Read cycle to be continued indefinitely. The whole memory can, therefore, be read with a
single READ instruction.
The Read cycle is terminated by driving Chip Select (S) High. The rising edge of the Chip
Select (S) signal can occur at any time during the cycle.
The first byte addressed can be any byte within any page.
The instruction is not accepted, and is not executed, if a Write cycle is currently in progress.
by setting the Status Register Write Disable (SRWD) bit after driving Write Protect (W)
Low
or by driving Write Protect (W) Low after setting the Status Register Write Disable
(SRWD) bit.
0
1
High Impedance
2
Instruction
Figure
3
4
5
11, to send this instruction to the device, Chip Select (S) is first driven
6
7
MSB
15
8
14 13
9 10
16-Bit Address
3
20 21 22 23 24 25 26 27
2
1
0
MSB
7
6
5
Data Out 1
4
3
28 29 30
2
1
0
31
7
Data Out 2
AI01793D
Instructions
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