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COP8CDR9 bảng dữ liệu(PDF) 22 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện COP8CDR9
Giải thích chi tiết về linh kiện  8-Bit CMOS Flash Microcontroller with 32k Memory, Virtual EEPROM, 10-Bit A/D and Brownout
PDF  84 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

COP8CDR9 bảng dữ liệu(HTML) 22 Page - National Semiconductor (TI)

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10.0 Functional Description (Continued)
10.4.1 Virtual EEPROM
The Flash memory and the User ISP functions (see Section
5.7), provide the user with the capability to use the flash
program memory to back up user defined sections of RAM.
This effectively provides the user with the same nonvolatile
data storage as EEPROM. Management, and even the
amount of memory used, are the responsibility of the user,
however the flash memory read and write functions have
been provided in the boot ROM.
One typical method of using the Virtual EEPROM feature
would be for the user to copy the data to RAM during system
initialization, periodically, and if necessary, erase the page of
Flash and copy the contents of the RAM back to the Flash.
10.5 OPTION REGISTER
The Option register, located at address 0x7FFF in the Flash
Program Memory, is used to configure the user selectable
security, WATCHDOG, and HALT options. The register can
be programmed only in external Flash Memory programming
or ISP Programming modes. Therefore, the register must be
programmed at the same time as the program memory. The
contents of the Option register shipped from the factory read
00 Hex.
10137410
FIGURE 7. RAM Organization
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