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Functional
Description
The AT25010A/020A/040A is designed to interface directly with the synchronous serial
peripheral interface (SPI) of the 6805 and 68HC11 series of microcontrollers.
The AT25010A/020A/040A utilizes an 8-bit instruction register. The list of instructions
and their operation codes are contained in Figure 5. All instructions, addresses, and
data are transferred with the MSB first and start with a high-to-low CS transition.
Table 5. Instruction Set for the AT25010A/020A/040A
Instruction Name
WREN
WRDI
RDSR
WRSR
READ
WRITE
Instruction Format
0000 X110
0000 X100
0000 X101
0000 X001
0000 A011
0000 A010
Operation
Set Write Enable Latch
Reset Write Enable Latch
Read Status Register
Write Status Register
Read Data from Memory Array
Write Data to Memory Array
Note:
“A” represents MSB address bit A8.
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. The WP pin must be held high during a WREN 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 read/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.
Table 6. Status Register Format
Bit 7
X
Bit 6
X
Bit 5
X
Bit 4
X
Bit 3
BP1
Bit 2
BP0
Bit 1
WEN
Bit 0
RDY
Table 7. Read Status Register Bit Definition
Bit
Bit 0 (RDY)
Bit 1 (WEN)
Bit 2 (BP0)
Bit 3 (BP1)
Definition
Bit 0 = “0” (RDY) indicates the device is ready. Bit 0 = “1”
indicates the write cycle is in progress.
Bit 1 = “0” indicates the device is not write enabled. Bit 1 = “1”
indicates the device is write enabled.
See Table 8.
See Table 8.
Bits 4–7 are “0”s when device is not in an internal write cycle.
Bits 0–7 are “1”s during an internal write cycle.
WRITE STATUS REGISTER (WRSR): The WRSR instruction allows the user to select
one of four levels of protection. The AT25010A/020A/040A is divided into four array seg-
ments. One-quarter, one-half, or all of the memory segments can be protected. Any of
8
AT25010A/020A/040A
3348J–SEEPR–8/06
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相关代理商/技术参数
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功能描述:IC EEPROM 4KBIT 20MHZ 8TSSOP 制造商:microchip technology 系列:- 包装:带卷（TR） 零件状态:停產 存储器类型:非易失 存储器格式:EEPROM 技术:EEPROM 存储容量:4Kb （512 x 8） 时钟频率:20MHz 写周期时间 - 字，页:5ms 存储器接口:SPI 电压 - 电源:1.8 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:8-TSSOP 基本零件编号:AT25040 标准包装:5,000
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AT25040A-10TU-2.7-T
功能描述:IC EEPROM 4KBIT 20MHZ 8TSSOP 制造商:microchip technology 系列:- 包装:带卷（TR） 零件状态:停產 存储器类型:非易失 存储器格式:EEPROM 技术:EEPROM 存储容量:4Kb （512 x 8） 时钟频率:20MHz 写周期时间 - 字，页:5ms 存储器接口:SPI 电压 - 电源:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:8-TSSOP 基本零件编号:AT25040 标准包装:3,000
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功能描述:IC EEPROM 4KBIT 20MHZ 8SOIC RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:96 系列:- 格式 - 存储器:闪存 存储器类型:FLASH 存储容量:16M（2M x 8，1M x 16） 速度:70ns 接口:并联 电源电压:2.65 V ~ 3.6 V 工作温度:-40°C ~ 85°C 封装/外壳:48-TFSOP（0.724"，18.40mm 宽） 供应商设备封装:48-TSOP 包装:托盘
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功能描述:IC EEPROM 4KBIT 20MHZ 8SOIC RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:96 系列:- 格式 - 存储器:闪存 存储器类型:FLASH 存储容量:16M（2M x 8，1M x 16） 速度:70ns 接口:并联 电源电压:2.65 V ~ 3.6 V 工作温度:-40°C ~ 85°C 封装/外壳:48-TFSOP（0.724"，18.40mm 宽） 供应商设备封装:48-TSOP 包装:托盘
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