参数资料
| 型号： | 25AA320-I/P |
| 厂商： | Microchip Technology |
| 文件页数： | 11/26页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 32KBIT 1MHZ 8DIP |
| 标准包装： | 60 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 32K (4K x 8) |
| 速度： | 1MHz |
| 接口： | SPI 3 线串行 |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 其它名称： | 25AA320I/P |
25AA320/25LC320/25C320
3.6
Write Status Register Instruction
When the chip is hardware write-protected, only writes
( WRSR )
The Write Status Register instruction ( WRSR ) allows the
user to select one of four levels of protection for the
array by writing to the appropriate bits in the STATUS
to nonvolatile bits in the STATUS register are disabled.
See Table 3-3 for a matrix of functionality on the WPEN
bit.
See Figure 3-7 for the WRSR timing sequence.
register. The array is divided up into four segments.
The user has the ability to write-protect none, one, two,
TABLE 3-2:
ARRAY PROTECTION
or all four of the segments of the array. The partitioning
is controlled as shown in Table 3-2.
The Write-Protect Enable (WPEN) bit is a nonvolatile
bit that is available as an enable bit for the WP pin. The
Write-Protect (WP) pin and the Write-Protect Enable
(WPEN) bit in the STATUS register control the pro-
grammable hardware write-protect feature. Hardware
write protection is enabled when WP pin is low and the
WPEN bit is high. Hardware write protection is disabled
when either the WP pin is high or the WPEN bit is low.
BP1
0
0
1
1
BP0
0
1
0
1
Array Addresses
Write-Protected
none
upper 1/4
(0C00h-0FFFh)
upper 1/2
(0800h-0FFFh)
all
(0000h-0FFFh)
FIGURE 3-7:
CS
WRITE STATUS REGISTER TIMING SEQUENCE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SCK
Instruction
Data to STATUS Register
SI
0
0
0
0
0
0
0
1
7
6
5
4
3
2
1
0
High-Impedance
SO
? 2008 Microchip Technology Inc.
DS21227F-page 11
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| 25AA320T | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:32K SPI Bus Serial EEPROM |
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