COP8AME9_14 Datasheet, PDF (17/102 Pages) Texas Instruments – COP8AME9 8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEPROM, Temperature Sensor, 10-Bit A/D and Brownout Reset

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COP8AME9, COP8ANE9
SNOS930F – MARCH 2001 – REVISED MARCH 2013
Figure 7. RAM Organization
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.
OPTION REGISTER
The Option register, located at address 0x1FFF 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
Reserved
SECURITY
Reserved
Bits 7, 6 These bits are reserved and must be 0.
Bit 2
WATCH
DOG
Bit 1
HALT
Bit 0
FLEX
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.
Bit 2
= 1 WATCHDOG feature disabled. G1 is a general purpose I/O.
= 0 WATCHDOG feature enabled. G1 pin is WATCHDOG output with weak pullup.
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