Are there any products that allow memory to be connected without using an external address decoder ?

Answer

The TLCS-900 Family and TX19 Family offer products that contain the chip select/wait controller function. This function enables a chip select signal to be directly output from a microcontroller by setting data in the appropriate register. 
TX03 Series have external bus interface that can be connected to SoC and external extended memory. 


TX03 Microcntrollers having external bus interface:

 

(NO.EA9901901 2011/10/24)