uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

CHAPTER 3 CPU ARCHITECTURE3.1.4 Data memory addressingEach product of the µPD789074 Subseries is provided with a wide range of addressing modes to make memorymanipulation as efficient as possible. The data memory area (FE00H to FFFFH) can be accessed using a uniqueaddressing mode according to its use, such as a special function register (SFR). Figures 3-5 through 3-8 illustrate thedata memory addressing.Figure 3-5. Data Memory Addressing (µPD789071)FFFFHSpecial function registers (SFRs)256 × 8 bitsSFR addressingFF20HFF1FHFF00HFEFFHInternal high-speed RAM256 × 8 bitsShort direct addressingFE20HFE1FHFE00HFDFFHDirect addressingRegister indirect addressingBased addressingReserved0800H07FFHInternal ROM2,048 × 8 bits0000H42User’s Manual U14801EJ3V1UD