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參數(shù)資料
| 型號： | AT25128-10PI-1.8 |
| 廠商： | ATMEL CORP |
| 元件分類： | DRAM |
| 英文描述： | SPI Serial EEPROMs |
| 中文描述： | 16K X 8 SPI BUS SERIAL EEPROM, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001BA, DIP-8 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 230K |
| 代理商： | AT25128-10PI-1.8 |
AT25128/256
7
Functional Description
The AT25128/256 is designed to interface directly with the
synchronous serial peripheral interface (SPI) of the 6800
type series of microcontrollers.
The AT25128/256 utilizes an 8-bit instruction register. The
list of instructions and their operation codes are contained
in Table 1. All instructions, addresses, and data are trans-
ferred with the MSB first and start with a high-to-low CS
transition..
Table 1.
Instruction Set for the AT25128/256
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 independent
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 instruc-
tion.
Table 2.
Status Register Format
WRITE STATUS REGISTER (WRSR):
The WRSR instruc-
tion allows the user to select one of four levels of protec-
tion. The AT25128/256 is divided into four array segments.
Top quarter (1/4), top half (1/2), or all of the memory seg-
ments can be protected. Any of the data within any
selected segment will therefore be READ only. The block
write protection levels and corresponding status register
control bits are shown in Table 4.
The three bits, BP0, BP1, and WPEN are nonvolatile cells
that have the same properties and functions as the regular
memory cells (e.g. WREN, t
WC
, RDSR).
Table 4.
Block Write Protect Bits
The WRSR instruction also allows the user to enable or
disable the write protect (WP) pin through the use of the
Write Protect Enable (WPEN) bit. Hardware write protec-
tion is enabled when the WP pin is low and the WPEN bit is
“1”. Hardware write protection is disabled when eitherthe
WP pin is high or the WPEN bit is “0.” When the device is
hardware write protected, writes to the Status Register,
including the Block Protect bits and the WPEN bit, and the
block-protected sections in the memory array are disabled.
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
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 3.
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 notWRITE
ENABLED. Bit 1 = 1 indicates the device is
WRITE ENABLED.
Bit 2 (BP0)
See Table 4.
Bit 3 (BP1)
See Table 4.
Bits 4-6 are 0s when device is not in an internal write cycle.
Bit 7
(WPEN)
See Table 5.
Bits 0-7 are 1s during an internal write cycle.
Level
Status Register Bits
Array Addresses
Protected
BP1
BP0
AT25128
AT25256
0
0
0
None
None
1(1/4)
0
1
3000 - 3FFF
6000 - 7FFF
2(1/2)
1
0
2000 - 3FFF
4000 - 7FFF
3(All)
1
1
0000 - 3FFF
0000 - 7FFF
相關PDF資料 |
PDF描述 |
|---|---|
| AT25256-10PI-1.8 | SPI Serial EEPROMs |
| AT25128T1-10TC-1.8 | 122 x 32 pixel format, Compact LCD size |
| AT25128T2-10TC-1.8 | 122 x 32 pixel format, Compact LCD size |
| AT25256T2-10TC-1.8 | 122 x 32 pixel format, Compact LCD size |
| AT25128T1-10TI-1.8 | 128 x 64 pixel format, LED or EL Backlight available |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT25128-10PI-2.7 | 功能描述:電可擦除可編程只讀存儲器 128K (16Kx8) RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| AT25128-10SC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:SPI Serial E2PROMs |
| AT25128-10SC-1.8 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:SPI Serial E2PROMs |
| AT25128-10SC-2.7 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:SPI Serial E2PROMs |
| AT25128-10SI | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:SPI Serial E2PROMs |
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