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参数资料
| 型号： | AT49BV040T |
| 厂商： | Atmel Corp. |
| 英文描述： | 512K x 8 Single 2.7-volt Battery-Voltage Flash Memory(512K x 8单电源2.7V Battery-Voltage技术闪速存储器) |
| 中文描述： | 为512k × 8单2.7伏电池电压快闪记忆体（为512k × 8单电源为2.7V电池电压技术闪速存储器） |
| 文件页数： | 3/14页 |
| 文件大小： | 278K |
| 代理商： | AT49BV040T |
AT49BV/LV040(T)
3
code to stay in the device while data in the rest of the
device is updated. This feature does not have to be acti-
vated; the boot block
’
s usage as a write-protected region is
optional to the user. The address range of the
AT49BV/LV040 boot block is 00000H to 03FFFH, while the
address range of the AT49BV/LV040T boot block is
7C000H to 7FFFFH.
Once the feature is enabled, the data in the boot block can
no longer be erased or programmed. Data in the main
memory block can still be changed through the regular pro-
gramming method. To activate the lockout feature, a series
of six program commands to specific addresses with spe-
cific data must be performed. Please refer to the Command
Definitions table.
BOOT BLOCK LOCKOUT DETECTION:
A software
method is available to determine if programming of the boot
block section is locked out. When the device is in the soft-
ware product identification mode (see Software Product
Identification Entry and Exit sections) a read from address
location 00002H will show if programming the boot block is
locked out for the AT49BV/LV040 and a read from address
7C002H will show if programming the boot block is locked
out for the AT49BV/LV040(T). If the data on I/O0 is low, the
boot block can be programmed; if the data on I/O0 is high,
the program lockout feature has been activated and the
block cannot be programmed. The software product identi-
fication code should be used to return to standard
operation.
PRODUCT IDENTIFICATION:
The product identification
mode identifies the device and manufacturer as Atmel.
It may be accessed by hardware or software operation. The
hardware operation mode can be used by an external pro-
grammer to identify the correct programming algorithm for
the Atmel product.
For details, see
“
Operating Modes
”
on page 5 (for hard-
ware operation) or
“
Software Product Identification
Entry/Exit
”
on page 10. The manufacturer and device
codes are the same for both modes.
DATA POLLING:
The AT49BV/LV040(T) features Data
Polling to indicate the end of a program cycle. During a pro-
gram cycle, an attempted read of the last byte loaded will
result in the complement of the loaded data on I/O7. Once
the program cycle has been completed, true data is valid
on all outputs and the next cycle may begin. Data Polling
may begin at any time during the program cycle.
TOGGLE BIT:
In addition to Data Polling, the
AT49BV/LV040(T) provides another method for determin-
ing the end of a program or erase cycle. During a program
or erase operation, successive attempts to read data from
the device will result in I/O6 toggling between one and
zero. Once the program cycle has completed, I/O6 will stop
toggling and valid data will be read. Examining the toggle
bit may begin at any time during a program cycle.
HARDWARE DATA PROTECTION:
The Hardware Data
Protection feature protects against inadvertent programs to
the AT49BV/LV040(T) in the following ways: (a) V
CC
sense:
if V
CC
is below 1.8V (typical), the program function is inhib-
ited. (b) Program inhibit: holding any one of OE low, CE
high or WE high inhibits program cycles. (c) Noise filter:
pulses of less than 15 ns (typical) on the WE or CE inputs
will not initiate a program cycle.
INPUT LEVELS:
While operating with a 2.7V to 3.6V
power supply, the address inputs and control inputs (OE,
CE and WE) may be driven from 0 to 5.5V without
adversely affecting the operation of the device. The I/O
lines can only be driven from 0 to V
CC
+ 0.6V.
相关PDF资料 |
PDF描述 |
|---|---|
| AT49LV040 | 512K x 8 Single 2.7-volt Battery-Voltage Flash Memory(512K x 8单电源2.7V Battery-Voltage技术闪速存储器) |
| AT49BV080 | 8-Megabit Single 2.7-volt Battery-Voltage Flash Memory(8M位单电源2.7V Battery-Voltage技术闪速存储器) |
| AT49LV080 | 8-Megabit Single 2.7-volt Battery-Voltage Flash Memory(8M位单电源2.7V Battery-Voltage技术闪速存储器) |
| AT49LV080T | 8-Megabit Single 2.7-volt Battery-Voltage Flash Memory(8M位单电源2.7V Battery-Voltage技术闪速存储器) |
| AT49BV1024A | 1-megabit (64K x 16) 3-volt Only Flash Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT49BV040T-12JC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Flash EEPROM |
| AT49BV040T-12JI | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Flash EEPROM |
| AT49BV040T-12TC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Flash EEPROM |
| AT49BV040T-12TI | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Flash EEPROM |
| AT49BV040T-12VC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Flash EEPROM |
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