CC78K4 datasheet(287/523 Pages) NEC

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CHAPTER 11 EXTENDED FUNCTIONS

User’s Manual U15556EJ1V0UM

287

11.3 Memory

The memory model is determined by the memory space of the target device.

(1) Memory model

A maximum of 1 MB of program memory space and a maximum of 16 MB of data memory space are available

(for the memory map, refer to the user’s manual of each target device).

This compiler has the three types of memory models: small, medium, and large. Objects are changed and output

by specifying each memory model option. For details of each model, refer to Table 11-2.

Table 11-2. Memory Model

Memory Model (Option)

Explanation

Small model (-MS)

A model with a combined code/data block capacity of 64

KB.

Medium model (-MM)

A model with a capacity of up to 1 MB for the code block

and 64 KB for the data block

Large model (-ML)

A model with a combined code/data block capacity of 16

MB, including up to 1 MB for the code block and 16 MB for

the data block.

(2) Register bank

•

The register bank is set to ‘RB0’ at startup (set in the startup routine of this compiler). Register bank 0 is

made always used (unless the register bank is changed) by this setting.

•

The specified register bank is set at the start of the interrupt function that has specified the change of the

(3) Location function

•

With the large model or medium model, the location function (-CS option) allows changing the location of the

internal RAM (including saddr area and sfr area) between 64 KB (LOCATION 00H) and 1024 KB (LOCATION

0FH) (with the small model, the location of the internal RAM is fixed to 64 KB). For the -CS option, refer to the

CC78K4 C Compiler Operation User’s Manual (U15557E).

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