RL78/D1A User's Manual: Hardware - Renesas

Under development
Preliminary document
Specifications in this document are tentative and subject to change.
RL78/D1A CHAPTER 3 CPU ARCHITECTURE
3.1.3 Internal data memory space
The RL78/D1A products incorporate the following RAMs.
Table 3-4. Internal RAM Capacity
Part Number Internal RAM
R5F10CGBxFB, R5F10CGCxFB, R5F10DGCxFB 2048 8 bits (FF700H to FFEFFH)
R5F10CGDxFB, R5F10DGDxFB, R5F10CLDxFB,
R5F10DLDxFB, R5F10CMDxFB, R5F10DMDxFB
3072 8 bits (FF300H to FFEFFH)
R5F10DGExFB, R5F10DLExFB, R5F10CMExFB,
R5F10DMExFB, R5F10DPExFB
4096 8 bits (FEF00H to FFEFFH)
R5F10DMFxFB, R5F10DPFxFB 6144 8 bits (FE700H to FFEFFH)
R5F10DMGxFB, R5F10DPGxFB 8192 8 bits (FDF00H to FFEFFH)
R5F10DMJxFB, R5F10TPJxFB, R5F10DPJxFB 16384 8 bits (FBF00H to FFEFFH)
The internal RAM can be used as a data area and a program area where instructions are written and executed. Four
general-purpose register banks consisting of eight 8-bit registers per bank are assigned to the 32-byte area of FFEE0H to
FFEFFH of the internal RAM area. However, instructions cannot be executed by using the general-purpose registers.
The internal RAM is used as stack memory.
Caution 1. It is prohibited to use the general-purpose register (FFEE0H to FFEFFH) space for fetching or as a
stack area.
2. Part of the internal RAM cannot be used as stack memory when using the self-programming function
and data flash function.
R01UH0317EJ0004 Rev. 0.04 85
Feb. 22, 2013