Datasheet

CHAPTER 3 CPU ARCHITECTURE

User’s Manual U18172EJ3V0UD

3.1.2 Internal data memory space

128-byte internal high-speed RAM is provided in the 78K0S/KU1+.

The internal high-speed RAM can also be used as a stack memory.

3.1.3 Special function register (SFR) area

Special function registers (SFRs) of on-chip peripheral hardware are allocated to the area of FF00H to FFFFH (see

Table 3-3).

3.1.4 Data memory addressing

The 78K0S/KU1+ are provided with a wide range of addressing modes to make memory manipulation as efficient

as possible. The area (FE80H to FEFFH) which contains a data memory and the special function register (SFR) area

can be accessed using a unique addressing mode in accordance with each function. Figures 3-4 to 3-6 illustrate the

data memory addressing.

Figure 3-4. Data Memory Addressing (

PD78F9200, 78F9500)

Special function registers (SFR)

256 × 8 bits

Internal high-speed RAM

128 × 8 bits

Flash memory

1,024 × 8 bits

Use prohibted

Direct addressing

Based addressing

SFR addressing

Short direct addressing

FFFFH

FF00H

FEFFH

FF20H

FE1FH

FE80H

FE7FH

0400H

03FFH

0000H

<R>