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參數(shù)資料
| 型號： | μPD29F008AL-X |
| 廠商： | NEC Corp. |
| 英文描述： | 8 M-Bit CMOS Low Voltage Flash Memory(8M CMOS低壓閃存) |
| 中文描述： | 8 m位的CMOS低電壓快閃記憶體（800萬的CMOS低壓閃存） |
| 文件頁數(shù)： | 11/44頁 |
| 文件大?。?/td> | 249K |
| 代理商： | ΜPD29F008AL-X |
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Preliminary Data Sheet
11
μ
PD29F008AL-X
3.5 Hardware Reset
The device can be reset to read mode by maintaining the /RESET pin at V
IL
at least during the t
RP
period.
While the /RESET pin is held at V
IL
, all write and read commands are ignored. Moreover, all output pins go into high
impedance. At this time, the supply current can be kept at 5
μ
A or below by maintaining /RESET at GND
±
0.2 V.
When performing reset, the operations in progress are all interrupted. Therefore, when reset is performed during
program or erase (including erase suspend), the address or sector data become undefined. In this case, after reset is
completed, perform the program or erase operation again.
3.6 Sector Protect
The sector protect function enables protection of any sector. Protected sectors cannot be programmed or erased,
and any combination of up to 19 sectors can be protected.
To select the sector protect mode, apply V
ID
to A9 and /OE. Moreover, input V
IL
, V
IH
, and V
IL
to A0, A1, and A6,
respectively, input the sector address of the sector to be protected to A13 to A19, and input V
IL
to /CE.
Sector protection starts at the falling edge of the /WE pulse and ends at the rising edge of the same pulse. Maintain
the sector address at a constant level during the /WE pulse interval.
To perform sector protect verification, apply V
ID
to A9. Also input V
IL
, V
IH
, and V
IL
to A0, A1, and A6, respectively,
and the sector address of the sector to be verified to A13 to A19. The other address pins are Don't Care (V
IL
is
recommended.)
When read from the input sector address is performed, the sector protect verification result is output to I/O0. If the
verified sector is protected, "1" is output to I/O0. If it is not protected, "0" is output.
Sector protect enables writing commands by applying V
ID
to /RESET. Moreover, it is also possible to unprotect the
sector with the same method. For details, see section
4.9 Sector Protect (by Command Input)
, and section
4.10
Sector Unprotect
.
Figure 3-1. Sector Protect Timing Chart
Note
The sector protect verification result is output.
01H : The sector is protected.
00H : The sector is not protected.
SAx
A13 - A19 (Input)
A0 (Input)
A1 (Input)
A6 (Input)
A9 (Input)
/OE (Input)
/WE (Input)
/CE (Input)
I/O (Output)
t
VLHT
t
VLHT
t
CSP
t
OESP
t
WPP
t
VLHT
t
VLHT
t
OE
SAy
01H
Note
V
ID
V
IH
V
ID
V
IH
(Sector protect)
(Verify sector protect)
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