
2009 Microchip Technology Inc.
DS39687E-page 15
PIC18F2XJXX/4XJXX FAMILY
3.3
Endurance and Retention
To maintain the endurance specification of the Flash
program memory cells, each byte should never be pro-
grammed more than once between erase operations.
Before attempting to modify the contents of a specific
byte of Flash memory a second time, an erase operation
(either a Bulk Erase or a Row Erase which includes that
byte) should be performed.