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Are dedicated settings needed to use 256KB/20KB of internal ROM/RAM?

Latest Updated:02/14/2006

Question:

In order to use 256KB/20KB of the internal ROM/RAM area in the 256KB version of M16C/62, M16C/62A, M16C/62M, and M16C/62N Group, are the dedicated settings necessary?

Answer:

The 256KB version of M16C/62, M16C/62A, M16C/62M, and M16C/62N Group has 256KB ROM (C0000h-FFFFFh) and 20KB RAM. However, only 192KB ROM (D0000h-FFFFFh) and 15KB RAM can be used after reset. Therefore, the reset vector of these products must point to within the range of D0000h-FFFFFh. To use the C0000h-FFFFFh area, the internal reserved area expansion bit (bit 3 of address 5h) must be set to "1" by the program in the above mentioned D0000h-FFFFFh area. On the other hand, when using the debugger, you can use the C0000h-FFFFFh area without initializing the internal reserved area expansion bit.
Suitable Products
M16C/62A
M16C/62A(M16C/62T)
M16C/62M
M16C/62N
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