M45PE80(2004) データシートの表示（PDF） - STMicroelectronics

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M45PE80
(Rev.:2004)

8 Mbit, Low Voltage, Page-Erasable Serial Flash Memory With Byte-Alterability and a 25 MHz SPI Bus Interface

STMicroelectronics 

M45PE80

Read Identification (RDID)

The Read Identification (RDID) instruction allows

the 8-bit manufacturer identification to be read, fol-

lowed by two bytes of device identification. The

manufacturer identification is assigned by JEDEC,

and has the value 20h for STMicroelectronics. The

device identification is assigned by the device

manufacturer, and indicates the memory type in

the first byte (40h), and the memory capacity of the

device in the second byte (14h).

Any Read Identification (RDID) instruction while

an Erase or Program cycle is in progress, is not

decoded, and has no effect on the cycle that is in

progress.

The device is first selected by driving Chip Select

(S) Low. Then, the 8-bit instruction code for the in-

struction is shifted in. This is followed by the 24-bit

device identification, stored in the memory, being

shifted out on Serial Data Output (Q), each bit be-

ing shifted out during the falling edge of Serial

Clock (C).

The instruction sequence is shown in Figure 10..

The Read Identification (RDID) instruction is termi-

nated by driving Chip Select (S) High at any time

during data output.

When Chip Select (S) is driven High, the device is

put in the Stand-by Power mode. Once in the

Stand-by Power mode, the device waits to be se-

lected, so that it can receive, decode and execute

instructions.

Table 5. Read Identification (RDID) Data-Out Sequence

Manufacturer Identification

Device Identification

Memory Type

Memory Capacity

20h

40h

14h

Figure 10. Read Identification (RDID) Instruction Sequence and Data-Out Sequence

S

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 18 28 29 30 31

C

Instruction

D

Manufacturer Identification

Device Identification

High Impedance

Q

15 14 13 3 2 1 0

MSB

MSB

AI06809

14/36

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