COP8CDR9KMT7 datasheet(22/84 Pages) NSC

Part #	COP8CDR9KMT7

Description	8-Bit CMOS Flash Microcontroller with 32k Memory, Virtual EEPROM, 10-Bit A/D and Brownout

PDF	84 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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22 / 84 page

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

COP8CDR9KMT7 Datasheet(PDF) 22 Page - National Semiconductor (TI)