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參數(shù)資料
| 型號： | AT25256A |
| 廠商： | Atmel Corp. |
| 英文描述： | SPI Serial Extended Temperature EEPROMs |
| 中文描述： | SPI串行EEPROM的擴展溫度 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大小： | 390K |
| 代理商： | AT25256A |
7
AT25128A/256A
5088C–SEEPR–11/04
Functional
Description
The AT25128A/256A is designed to interface directly with the synchronous serial
peripheral interface (SPI) of the 6800 type series of microcontrollers.
The AT25128A/256A utilizes an 8-bit instruction register. The list of instructions and
their operation codes are contained in Table 5. All instructions, addresses, and data are
transferred with the MSB first and start with a high-to-low CS transition.
WRITE ENABLE (WREN):
The device will power-up in the write disable state when V
CC
is applied. All programming instructions must therefore be preceded by a Write Enable
instruction.
WRITE DISABLE (WRDI):
To protect the device against inadvertent writes, the Write
Disable instruction disables all programming modes. The WRDI instruction is indepen-
dent of the status of the WP pin.
READ STATUS REGISTER (RDSR):
The Read Status Register instruction provides
access to the status register. The READY/BUSY and Write Enable status of the device
can be determined by the RDSR instruction. Similarly, the block write protection
bits indicate the extent of protection
employed. These bits are set by using the WRSR
instruction
.
WRITE STATUS REGISTER (WRSR):
The WRSR instruction allows the user to select
one of four levels of protection. The AT25128A/256A is divided into four array segments.
Table 5.
Instruction Set for the AT25128A/256A
Instruction Name
Instruction Format
Operation
WREN
0000 X110
Set Write Enable Latch
WRDI
0000 X100
Reset Write Enable Latch
RDSR
0000 X101
Read Status Register
WRSR
0000 X001
Write Status Register
READ
0000 X011
Read Data from Memory Array
WRITE
0000 X010
Write Data to Memory Array
Table 6.
Status Register Format
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
WPEN
X
X
X
BP1
BP0
WEN
RDY
Table 7.
Read Status Register Bit Definition
Bit
Definition
Bit 0 (RDY)
Bit 0 = “0” (RDY) indicates the device is ready.
Bit 0 = “1” indicates the write cycle is in progress.
Bit 1 (WEN)
Bit 1 = “0” indicates the device is not WRITE ENABLED. Bit 1 = “1”
indicates the device is write enabled.
Bit 2 (BP0)
See Table 8.
Bit 3 (BP1)
See Table 8.
Bits 4–6 are “0”s when device is not in an internal write cycle.
Bit 7 (WPEN)
See Table 9.
Bits 0–7 are “1”s during an internal write cycle.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT25128A-10PQ-2.7 | SPI Serial Extended Temperature EEPROMs |
| AT25128A-10TQ-2.7 | SPI Serial Extended Temperature EEPROMs |
| AT25128AN-10SE-2.7 | SPI Serial Extended Temperature EEPROMs |
| AT25128AN-10SQ-2.7 | SPI Serial Extended Temperature EEPROMs |
| AT25320 | 32K SPI Serial EEPROMs(32K SPI串行EEPROM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT25256A-10CI-1.8 | 功能描述:IC EEPROM 256KBIT 20MHZ 8LAP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:- 標準包裝:96 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:16M（2M x 8，1M x 16） 速度:70ns 接口:并聯(lián) 電源電壓:2.65 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TFSOP（0.724"，18.40mm 寬） 供應商設(shè)備封裝:48-TSOP 包裝:托盤 |
| AT25256A-10CI-2.7 | 功能描述:IC EEPROM 256KBIT 20MHZ 8LAP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:- 標準包裝:96 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:16M（2M x 8，1M x 16） 速度:70ns 接口:并聯(lián) 電源電壓:2.65 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TFSOP（0.724"，18.40mm 寬） 供應商設(shè)備封裝:48-TSOP 包裝:托盤 |
| AT25256A-10PI-1.8 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:SPI Serial EEPROMs |
| AT25256A-10PI-2.7 | 制造商:Atmel Corporation 功能描述:EEPROM Serial-SPI 256K-bit 32K x 8 3.3V/5V 8-Pin PDIP |
| AT25256A-10PU1.8 | 制造商:Atmel Corporation 功能描述:32K X 8 SPI BUS SERIAL EEPROM, PDIP8 |
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