AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 41

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

Question 3
Answer 3
Question 4
Answer 4
Question 5
Answer 5
Question 6
Answer 6
AN2156
MOTOROLA
NOTE:
What is the FLASH charge pump?
The charge pump is a dynamic (clocked) circuit which generates high
voltages internally in the FLASH to program and erase the nonvolatile
memory. Users do not have access to these voltages.
The MC68HC908AS60A/AZ60A FLASH programs one row (64 bytes) at
a time. Do I always have to program the entire row?
No, it is not necessary to program the entire row. Addresses which are
not programmed are left as they were before the row programming was
started. However, before reprogramming any additional bytes in this
row, the entire page must be erased.
During a program/erase process, can I execute an interrupt service or
include additional steps?
Unrelated (non-FLASH) 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 may cause errors in the
program or erase timing and lead to corrupt or missing data in the
FLASH. Motorola does not recommend the use of interrupts during the
program or erase operations.
Make certain not to enter stop or wait mode during a program or erase
operation. High voltage may be exposed to bit cells for an extended
period and may cause permanent damage.
I am executing program/erase code out of one of the memory arrays.
Can the same array be programmed/erased?
No.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
FLASH Frequently Asked Questions
Application Note
41