Demonstrations for flash program and erase operation.
1. Flash program demo : program 16 bytes data into the last page of Code flash
, then read back and check.

Program Data    : 0xA5A5A5A5 
Program Address : FLASH_CODE_PAGESIZE * FLASH_CODE_MAX_SECTNUM 
Program Type    : FLASH_TYPEPROGRAM_WORD

2. Flash erase demo : erase the last page of Code flash.
Erase Sector : FLASH_CODE_MAX_SECTNUM 
Erase Type   : FLASH_TYPEERASE_SECTORS
