M39832 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M39832

Single Chip 8 Mbit (1Mb x8 or 512Kb x16) Flash and 256 Kbit Parallel EEPROM Memory

STMicroelectronics 

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M39832

Figure 9. Block Unprotecting Flowchart

START

EE = EF = VIH

n=0

A6, A12, A15 = VIH

G, A9 = VIH

Wait 4µs

EF, G, A9 = VID

Wait 4µs

W = VIL

Wait 10ms

W = VIH

EF, G = VIH

Wait 4µs

READ at UNPROTECTION

ADDRESS: A1, A6 = VIH, A0 = VIL and

A12 to A18 DEFINING BLOCK

(see Note 1)

NO ++n

= 1000

YES

FAIL

NO DATA YES

=

00h

INCREMENT

BLOCK

LAST NO

BLOCK

YES

PASS

AI00850

Note: 1. A6 is kept at VIH during unprotection algorithm in order to secure best unprotection verification. During all other protection status

reads, A6 must be kept at VIL.

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