COP8CCR9IMT7SLASHNOPB datasheet(24/111 Pages) TI1

24 / 111 page

COP8CBR9, COP8CCR9, COP8CDR9

SNOS535I – OCTOBER 2000 – REVISED MARCH 2013

www.ti.com

Figure 5-1. RAM Organization

5.4.1

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.

5.5

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.

The format of the Option register is as follows:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

WATCH

Reserved

SECURITY

Reserved

HALT

FLEX

DOG

Bits 7, 6

These bits are reserved and must be 0.

Bit 5

= 1

Security enabled. Flash Memory read and write are not allowed except in User ISP/Virtual E2

commands. Mass Erase is allowed.

= 0

Security disabled. Flash Memory read and write are allowed.

Bits 4, 3

These bits are reserved and must be 0.

Functional Description

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Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9

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