Chapter 3 Cpu Architecture; Memory Space - NEC 78K0 Series User Manual

8-bit single-chip microcontrollers

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Products in the 78K0/KE2 can access a 64 KB memory space. Figures 3-1 to 3-8 show the memory maps.

Cautions 1. Regardless of the internal memory capacity, the initial values of the internal memory size

switching register (IMS) and internal expansion RAM size switching register (IXS) of all

products in the 78K0/KE2 are fixed (IMS = CFH, IXS = 0CH).

corresponding to each product as indicated below.

2. To set the memory size, set IMS and then IXS. Set the memory size so that the internal ROM

and internal expansion RAM areas do not overlap.

Table 3-1. Set Values of Internal Memory Size Switching Register (IMS)

Flash Memory Version

PD78F0537, 78F0537D

PD78F0536, 78F0537, and 78F0537D have internal ROMs of 96 KB and 128 KB, respectively.

However, the set value of IMS of these devices is the same as those of the 48 KB product because memory

banks are used. For how to set the memory banks, see 4.2 Memory Bank Select Register (BANK).

CHAPTER 3 CPU ARCHITECTURE

and Internal Expansion RAM Size Switching Register (IXS)

Preliminary User's Manual U17260EJ3V1UD

Internal High-Speed

RAM Capacity

Therefore, set the value

Internal Expansion

RAM Capacity

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