CHAPTER 3 CPU ARCHITECTURE
3.1.2 Internal data memory (internal high-speed RAM) space
The µPD789426, 789436, 789446, and 789456 Subseries products incorporate the following RAM.
(1) Internal high-speed RAM
Internal high-speed RAM is incorporated in the area between FD00H and FEFFH.
The internal high-speed RAM is also used as a stack.
(2) LCD display RAM
LCD display RAM is incorporated.
The LCD display RAM can also be used as ordinary RAM.
Each subseries incorporates LCD display RAM with the following capacity.
Table 3-3. LCD Display RAM Capacity
Subseries Name
Area
Capacity
5 × 4 bits
15 × 4 bits
µPD789426, 789436 Subseries
µPD789446, 789456 Subseries
FA00H to FA04H
FA00H to FA0EH
3.1.3 Special function register (SFR) area
Special function registers (SFRs) of on-chip peripheral hardware are allocated in the area between FF00H to
FFFFH (see Table 3-4).
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User’s Manual U15075EJ1V0UM00
NEC [ NEC ]
