UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 84

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

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3.1.3 Special function register (SFR) area
Table 3-7. Special Function Register List).
3.1.4 Extended function register (EFR) area
F9F8H to F9FFH (refer to Table 3-8. Extended Function Register List).
3.1.5 Data memory addressing
the register or memory relevant to the execution of instructions.
78K0/Dx2, based on operability and other considerations. For areas containing data memory in particular, special
addressing methods designed for the functions of special function registers (SFR) and general-purpose registers are
available for use. Figure 3-5 to 3-8 show correspondence between data memory and addressing. For details of each
addressing mode, refer to 3.4 Operand Address Addressing.
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On-chip peripheral hardware special function registers (SFRs) are allocated in the area FF00H to FFFFH (refer to
On-chip peripheral hardware extended function registers (EFRs) are allocated in the area F980H to F9CFH and
Addressing refers to the method of specifying the address of the instruction to be executed next or the address of
Several addressing modes are provided for addressing the memory relevant to the execution of instructions for the
Caution Do not access addresses to which SFRs are not assigned.
Caution Do not access addresses to which EFRs are not assigned.
Remark The following methods are available to specify the EFRs to undergo manipulation during instruction
execution.
1. Direct addressing
2. Register indirect addressing
3. Based addressing
4. Based indexed addressing
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 3 CPU ARCHITECTURE