M45PE40-VMP6TP datasheet(15/35 Pages) STMICROELECTRONICS

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M45PE40

Read Data Bytes (READ)

The device is first selected by driving Chip Select

(S) Low. The instruction code for the Read Data

Bytes (READ) instruction is followed by a 3-byte

address (A23-A0), each bit being latched-in during

the rising edge of Serial Clock (C). Then the mem-

ory contents, at that address, is shifted out on Se-

rial Data Output (Q), each bit being shifted out, at

a maximum frequency fR, during the falling edge of

Serial Clock (C).

The instruction sequence is shown in Figure 11..

The first byte addressed can be at any location.

The address is automatically incremented to the

next higher address after each byte of data is shift-

ed out. The whole memory can, therefore, be read

with a single Read Data Bytes (READ) instruction.

When the highest address is reached, the address

counter rolls over to 000000h, allowing the read

sequence to be continued indefinitely.

The Read Data Bytes (READ) instruction is termi-

nated by driving Chip Select (S) High. Chip Select

(S) can be driven High at any time during data out-

put. Any Read Data Bytes (READ) instruction,

while an Erase, Program or Write cycle is in

progress, is rejected without having any effects on

the cycle that is in progress.

Figure 11. Read Data Bytes (READ) Instruction Sequence and Data-Out Sequence

Note: Address bits A23 to A19 are Don’t Care.

AI03748D

3456789 10

28 29 30 31 32 33 34 35

22 21

3210

36 37 38

76543

High Impedance

Data Out 1

Instruction

24-Bit Address

MSB

Data Out 2

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