PSD835G2V_07 datasheet(3/118 Pages) STMICROELECTRONICS

Part #	PSD835G2V

Description	Flash PSD, 3 V supply, for 8-bit MCUs 4 Mbit 256 Kbit dual Flash memories and 64 Kbit SRAM

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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3 / 118 page

PSD835G2V

Contents

3/118

6.5

Ready/Busy (PE4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.6

Memory operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7

Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.1

Power-up mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.2

READ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.3

Read Memory Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.4

Read Primary Flash Identifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.5

Read Memory Sector Protection Status . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.6

Read the Erase/Program Status Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.7

Data polling flag (DQ7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.8

Toggle flag (DQ6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.9

Error flag (DQ5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

7.10

Erase time-out flag (DQ3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

8

Programming Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

8.1

Data polling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

8.2

Data toggle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

8.2.1

Unlock bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9

Erasing Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.1

Flash Bulk Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.2

Flash Sector Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.3

Suspend Sector Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

9.4

Resume Sector Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

10

Specific features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

10.1

Flash memory sector protect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

10.2

Reset Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

10.3

Reset (RESET) signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

11

SRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

12

Sector Select and SRAM Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

12.1

Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

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