CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U16846EJ1V0UD
39
3.1.2 Internal data memory space
78K0/KB1+ products incorporate the following internal high-speed RAM.
Table 3-4. Internal High-Speed RAM Capacity
Part Number
Internal High-Speed RAM
µ
PD78F0101H 512
×
8 bits (FD00H to FEFFH)
µ
PD78F0102H
µ
PD78F0103H
768
×
8 bits (FC00H to FEFFH)
The 32-byte area FEE0H to FEFFH is assigned to four general-purpose register banks consisting of eight 8-bit
registers per bank.
This area cannot be used as a program area in which instructions are written and executed.
The internal high-speed RAM can also be used as a stack memory.
3.1.3 Special function register (SFR) area
On-chip peripheral hardware special function registers (SFRs) are allocated in the area FF00H to FFFFH (refer to
Table 3-5 Special Function Register List in 3.2.3 Special Function Registers (SFRs)).
Caution Do not access addresses to which SFRs are not assigned.