Datasheet 搜索 > 微控制器 > Microchip（微芯） > PIC18F26K20-I/SO 数据手册 > PIC18F26K20-I/SO 开发手册 3/18 页
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PIC18F26K20-I/SO 开发手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
SOIC-28
描述:
MICROCHIP PIC18F26K20-I/SO 微控制器, 8位, 闪存, AEC-Q100, PIC18FxxKxx, 64 MHz, 64 KB, 3.84 KB, 28 引脚, SOIC
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
应用领域在P1P5P15
导航目录
PIC18F26K20-I/SO数据手册
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若手册格式错乱，请下载阅览PDF原文件
© 2011 Microchip Technology Inc. DS01095D-page 3
AN1095
Only one erase/write cycle is consumed for the page as
each location within the page is programmed once prior
to the page erase. As a result, the algorithm
multiplicatively improves the emulated data EEPROM
effective endurance.
The previously filled page is erased only after the latest
information has been programmed into the next
available page and successfully verified. Through this
process, the information is always stored in nonvolatile
memory which minimizes the effects of an unexpected
loss of power.
As the program memory page is filled sequentially from
beginning to end, the algorithm assumes the most
current data EEPROM information is the closest
instance to the end of the page. To simplify the read
operation, the search begins at the end of the current
program memory page and works toward the start of the
page – looking for the specified data EEPROM address.
When a match is found, the associated data is returned
for the first instance of the provided address. If the
address is not found, the return value of all ones, 0xFF
or 0xFFFF, is returned to emulate the result of an
unwritten address in an independent data EEPROM.
TABLE 3: WRITE DATA EEPROM (0x0202, 2) TABLE 4: WRITE DATA EEPROM (0x0707, 7)
Page Address Data EE Address Data EE Data Page Address Data EE Address Data EE Data
Page + 0
Page Status<23:16> 0x0000
Page + 0
Page Status<23:16> 0x0001
Page + 2
2 0x0202
Page + 2
2 0x0202
Page + 4
0xFF 0xFFFF
Page + 4
7 0x0707
Page + 6
0xFF 0xFFFF
Page + 6
0xFF 0xFFFF
Page + 8
0xFF 0xFFFF
Page + 8
0xFF 0xFFFF
.
.
.
.
.
.
Page + 1022
0xFF 0xFFFF
Page + 1022
0xFF 0xFFFF
TABLE 5: WRITE DATA EEPROM (0x2222, 2) TABLE 6: WRITE DATA EEPROM (0x0A0A, 0xA)
Page Address Data EE Address Data EE Data Page Address Data EE Address Data EE Data
Page + 0
Page Status<23:16> 0x0000
Page + 0
Page Status<23:16> 0x0000
Page + 2
2 0x0202
Page + 2
2 0x0202
Page + 4
7 0x0707
Page + 4
7 0x0707
Page + 6
2 0x2222
Page + 6
2 0x2222
Page + 8
0xFF 0xFFFF
Page + 8
0xA 0x0A0A
.
.
.
.
.
.
Page + 1022
0xFF 0xFFFF
Page + 1022
0xFF 0xFFFF
TABLE 7: WRITE DATA EEPROM (0x7777, 7) TABLE 8: PAGE AFTER PACK OPERATION
Page Address Data EE Address Data EE Data Page Address Data EE Address Data EE Data
Page + 0
Page Status<23:16> 0x0000
Page + 0
Page Status<23:16> 0x0001
Page + 2
2 0x0202
Page + 4
2 0x2222
Page + 4
7 0x0707
Page + 6
7 0x7777
Page + 6
2 0x2222
Page + 2
0xA 0x0A0A
Page + 8
0xA 0x0A0A
Page + 8
0xFF 0xFFFF
.
.
.
.
.
.
Page + 1022
7 0x7777
Page + 1022
0xFF 0xFFFF
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