Filter
Top Products
RL78/G1A CHAPTER 3 CPU ARCHITECTURE
R01UH0305EJ0200 Rev.2.00 59
Jul 04, 2013
3.1.3 Internal data memory space
The RL78/G1A products incorporate the following RAMs.
Table 3-4. Internal RAM Capacity
Part Number Internal RAM
R5F10ExA (x = 8, B, G)
R5F10ExC (x = 8, B, G, L)
2048 × 8 bits (FF700H to FFEFFH)
R5F10ExD (x = 8, B, G, L)
3072 × 8 bits (FF300H to FFEFFH)
R5F10ExE (x = 8, B, G, L)
4096 × 8 bits (FEF00H to FFEFFH)
The internal RAM can be used as a data area and a program area where instructions are fetched (it is prohibited to use
the general-purpose register area for fetching instructions). 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.
The internal RAM is used as stack memory.
Cautions 1. It is prohibited to use the general-purpose register (FFEE0H to FFEFFH) space for fetching
instructions or as a stack area.
2. During self programming and data flash rewriting, the stack, data buffer, and RAM addresses
used as branch destinations for vectored interrupts or as sources or destinations of DMA
transfers must not be allocated to the area between addresses FFE20H and FFEDFH.
3. During self programming and data flash rewriting, the RAM area in the products below is
prohibited. Because this area is used for each library.
R5F10ExD (x = 8, B, G, L): FF300H to FF309H
R5F10ExE (x = 8, B, G, L): FEF00H to FF309H