How to read this memory map of LPC1769 microcontroller?
There are parts with different amounts of Flash memory. The Flash memory starts at address 0 for all devices and if it has 512kB of Flash the final address is 7FFFFh and reserved area starts at 80000h. Parts with less memory such as 256kB has last address of 3FFFFh respectively so the reserved area starts at 40000h. They are all just stuffed into one picture that is clipped from bottom if you look carefully.

Here is an extract from the relevant User Manual where this is better explained: