5-9
Using an EEPROM or EPROM
TI545/TI555 System Manual
8.
If the program is correct and you want to run the program from
EEPROM, use the Source Toggle option to select EEPROM as the
program source.
Electronic devices can operate in an unsafe condition that can
cause death or serious injury and/or damage to equipment.
When you select EEPROM, the controller is cleared and then
loaded with the EEPROM content. This clears V-memory and resets
all timers, counters, and drums, etc.
Be sure that you really want to select EEPROM.
9.
Use AUX 17 to check the program carefully, while the CPU is in the
PROGRAM mode, before allowing the CPU to control equipment
connected to the I/O.
If an error occurs during the copy process it will be listed on the
programming unit. If an error occurs, perform the following checks:
•
Ensure that the EEPROM jumper pin programming enable strap is
installed correctly.
•
Ensure that an EEPROM, not an EPROM, is installed.
•
Ensure that all EEPROM pins are properly seated in the socket.
Other possible causes for errors include the following:
•
The EEPROM may be defective.
•
The EEPROM may already have been programmed (and not erased).
Use the AUX Function 84 to erase program data on the EEPROM.
•
The size of your user program that is being stored may exceed the size
of the installed EEPROM (126K bytes or 254K bytes).
If you suspect a defective EEPROM, power down, remove the EEPROM,
install another EEPROM, power up again and repeat the programming
procedure.
WARNING
!