CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U16315EJ1V0UD
53
3.1.2 Internal data memory space
78K0/KD1 Series products incorporate the following internal high-speed RAMs.
Table 3-4. Internal High-Speed RAM Capacity
Part Number
Internal High-Speed RAM
µ
PD780121
µ
PD780122
512
×
8 bits (FD00H to FEFFH)
µ
PD780123
µ
PD780124
µ
PD78F0124
1024
×
8 bits (FB00H to FEFFH)
The 32-byte area FEE0H to FEFFH is assigned to four general-purpose register banks consisting of eight 8-bit
registers per one 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.
Содержание 78K0/KD1 Series
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