参数资料
型号: SST25LF020A-33-4C-SAE-T
厂商: Microchip Technology
文件页数: 8/27页
文件大小: 0K
描述: IC FLASH SER 2MB 33HZ SPI 8SOIC
标准包装: 3,300
系列: SST25
格式 - 存储器: 闪存
存储器类型: FLASH
存储容量: 2M (256K x 8)
速度: 33MHz
接口: SPI 串行
电源电压: 3 V ~ 3.6 V
工作温度: 0°C ~ 70°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
2 Mbit SPI Serial Flash
A Microchip Technology Company
SST25LF020A
Not Recommended for New Designs
Write Enable Latch (WEL)
The Write-Enable-Latch bit indicates the status of the internal memory Write Enable Latch. If the
Write-Enable-Latch bit is set to “1”, it indicates the device is Write enabled. If the bit is set to “0” (reset),
it indicates the device is not Write enabled and does not accept any memory Write (Program/Erase)
commands. The Write-Enable-Latch bit is automatically reset under the following conditions:
?
?
?
?
?
?
?
Power-up
Write-Disable (WRDI) instruction completion
Byte-Program instruction completion
Auto Address Increment (AAI) programming reached its highest memory address
Sector-Erase instruction completion
Block-Erase instruction completion
Chip-Erase instruction completion
Block Protection (BP1, BP0)
The Block-Protection (BP1, BP0) bits define the size of the memory area, as defined in Table 4, to be
software protected against any memory Write (Program or Erase) operations. The Write-Status-Regis-
ter (WRSR) instruction is used to program the BP1 and BP0 bits as long as WP# is high or the Block-
Protect-Lock (BPL) bit is 0. Chip-Erase can only be executed if Block-Protection bits are both 0. After
power-up, BP1 and BP0 are set to 1.
Block Protection Lock-Down (BPL)
WP# pin driven low (V IL ), enables the Block-Protection-Lock-Down (BPL) bit. When BPL is set to 1, it
prevents any further alteration of the BPL, BP1, and BP0 bits. When the WP# pin is driven high (V IH ),
the BPL bit has no effect and its value is “Don’t Care”. After power-up, the BPL bit is reset to 0.
Table 4: Software Status Register Block Protection 1
Status Register Bit
Protected Memory Area
Protection Level
0
1 (1/4 Memory Array)
2 (1/2 Memory Array)
3 (Full Memory Array)
BP1
0
0
1
1
BP0
0
1
0
1
2 Mbit
None
030000H-03FFFFH
020000H-03FFFFH
000000H-03FFFFH
T4.0 25080
1. Default at power-up for BP1 and BP0 is ‘11’.
Auto Address Increment (AAI)
The Auto Address Increment Programming-Status bit provides status on whether the device is in AAI
programming mode or Byte-Program mode. The default at power up is Byte-Program mode.
?2011 Silicon Storage Technology, Inc.
8
DS25080A
11/11
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