FACTORY mask programmable, great if you want 1.000.000 pieces. YOU can not program such a device. If, however you set the EA pin, uou can run it with external code memory. You can use a romless initially and switch to an OTP (one time programmable) also known as EPROM when your code is verified. I know offhand of no EEPROM or flash devices with a 10 bit internal ADC, however I'm sure they exist.

Have fun,

Erik