M39432 Datasheet, PDF (12/28 Pages) STMicroelectronics – Single Chip 4 Mbit Flash Memory and 256 Kbit Parallel EEPROM

M39432
Figure 8. Sector Protection Flowchart
START
SECTOR ADDRESS
on A16, A17, A18
EE = VIH
n=0
G, A9 = VID,
EF = VIL
Wait 4µs
W = VIL
Wait 100µs
W = VIH
G = VIH
Wait 4µs
Verify Sector
Protection Status¹
DQ0 ^NO
=1
YES
A9 = VIH
PASS
++n NO
= 25
YES
A9 = VIH
FAIL
Note: 1. The Verify Sector Protection Status operation is specified in Table 9.
AI01948C
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