NEC PD789488, PD789489, PD78F9488, PD78F9489 - page 53

CHAPTER 3 CPU ARCHITECTURE
User’s Manual U15331EJ4V1UD 53
3.1.2 Internal data memory space
(1) Internal high-speed RAM and internal low-speed RAM
The
µ PD789489 Subseries products incorporate the internal high-speed RAM and internal low-speed RAM of
the following capacity for each product.
The internal high-speed RAM can also be used as a stack.
The internal low-speed RAM cannot be used as a stack.
Table 3-3. Internal High-Speed RAM, Internal Low-Speed RAM Capacity
Part Number Internal High-Speed RAM Internal Low-Speed RAM
µ PD789488
µ PD78F9488
−
µ PD789489
1024 × 8 bits
µ PD78F9489
512 × 8 bits
(2) LCD display RAM
LCD display RAM is incorporated in the area between FA00H and FA1BH.
The LCD display RAM can also be used as ordinary RAM.
3.1.3 Special function register (SFR) area
Special function registers (SFRs) of on-chip peripheral hardware are allocated in the area between FF00H and
FFFFH (see Table 3-4).