SST25PF080B

DS20005137B-page 8

 2014 Microchip Technology Inc.

4.5.1

READ (33/25 MHZ)

The Read instruction, 03H, supports up to 33 MHz (2.7-

3.6V operation) or 25 MHz (2.3-2.7V operation) Read.

The device outputs the data starting from the specified

address location. The data output stream is continuous

through all addresses until terminated by a low to high

transition on CE#. The internal address pointer will

automatically increment until the highest memory

address is reached. Once the highest memory address

is reached, the address pointer will automatically incre-

ment to the beginning (wrap-around) of the address

space. Once the data from address location 1FFFFFH

has been read, the next output will be from address

location 000000H.

The Read instruction is initiated by executing an 8-bit

command, 03H, followed by address bits [A23-A0].

CE# must remain active low for the duration of the

Read cycle. See Figure 4-3 for the Read sequence.

FIGURE 4-3:

READ SEQUENCE

4.5.2

HIGH-SPEED-READ (80/50 MHZ)

The High-Speed-Read instruction supporting up to 80

MHz (2.7-3.6V operation) or 50 MHz (2.3-2.7V opera-

tion) Read is initiated by executing an 8-bit command,

0BH, followed by address bits [A23-A0] and a dummy

byte. CE# must remain active low for the duration of the

High-Speed-Read cycle. See Figure 4-4 for the High-

Speed-Read sequence.

Following a dummy cycle, the High-Speed-Read

instruction outputs the data starting from the specified

address location. The data output stream is continuous

through all addresses until terminated by a low to high

transition on CE#. The internal address pointer will

automatically increment until the highest memory

address is reached. Once the highest memory address

is reached, the address pointer will automatically incre-

ment to the beginning (wrap-around) of the address

space. Once the data from address location FFFFFH

has been read, the next output will be from address

location 00000H.

FIGURE 4-4:

HIGH-SPEED-READ SEQUENCE

and Device ID output stream is continuous until terminated by a low-to-high transition on CE#.

9. Requires a prior WREN command.

25137 ReadSeq 0.0

CE#

SO

SI

SCK

ADD.

01 2 3 4 5 6 7 8

ADD.

ADD.

03

HIGH IMPEDANCE

15 16

23 24

31 32

39 40

70

47

48

55 56

63 64

N+2

N+3

N+4

N

N+1

MSB

MSB

MSB

MODE 0

MODE 3

25137 HSRdSeq.0

CE#

SO

SI

SCK

ADD.

012 34 5

6 7 8

ADD.

ADD.

0B

HIGH IMPEDANCE

15 16

23 24

31 32

39 40

47 48

55 56

63 64

N+2

N+3

N+4

N

N+1

X

MSB

MSB

MSB

MODE 0

MODE 3

80

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