AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 48

• Manufacturer Part Number: AN2156
• Description: Programming and Erasing FLASH and EEPROM Memories on the MC68HC908AS60A/AZ60A
• Manufacturer: Freescale Semiconductor / Motorola

Application Note
Question 3
Answer 3
Question 4
Answer 4
Question 5
Answer 5
Question 6
Answer 6
48
What is the benefit of using the AUTO mode?
When you use the AUTO EEPROM programming and erasing
algorithms, the programming and erasing time is much less than when
you use the standard EEPROM algorithms. Whenever programming or
erasing is done, the EEPGM bit is automatically cleared, eliminating the
wait for a fixed delay time. Furthermore, since the delay time is not
necessary, the delay routine is not required in your code.
During a program/erase process, can I execute an interrupt service or
include additional steps?
Unrelated (non-EEPROM) steps may be included between steps of the
program/erase algorithms as long as the sequence of the steps remains
consistent. However, interrupt service routines can cause errors in the
program or erase timing and lead to corrupt or missing data in the
EEPROM. Motorola does not guarantee performance of the EEPROM if
interrupts are not masked during the program or erase operation.
Can I program each bit in the same EEPROM location successively?
No. However, the same byte location can be successively programmed
using selective bit programming. Refer to
I programmed the EExNVR register to un-protect EEPROM blocks, so
why are the blocks are still protected?
Did you reset the part or read the EExNVR after the register was
programmed? Since a new configuration value is not loaded
automatically to the EExACR register, resetting or reading the EExNVR
is required to set up the new configuration.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Selective Bit
Programming.
MOTOROLA
AN2156