M39432-12VNC6 查看數據表（PDF） - STMicroelectronics

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M39432-12VNC6

Single Chip 4 Mbit Flash Memory and 256 Kbit Parallel EEPROM

STMicroelectronics 

M39432

Figure 9. Sector Unprotecting Flowchart

START

EE = EF = VIH

n=0

A18, A17, A16 = VIH

A12, A9, A6, G = VIH

Wait 4µs

EF, G, A9 = VID

Wait 4µs

W = VIL

Wait 10ms

W = VIH

EF, G = VIH

Wait 4µs

Verify Sector

Protection Status1,2

Previous Sector

(Decrement A18, A17, A16)

NO DQ0-7 YES

=

00h

NO ++n

= 1000

YES

FAIL

Last NO

Sector

YES

PASS

AI01949C

Note: 1. The Verify Sector Status operation is specified in Table 10.

2. 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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