UPD78F0138 NEC, UPD78F0138 Datasheet - Page 59

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

3.1.2 Internal data memory space
(1) Internal high-speed RAM
(2) Internal expansion RAM
3.1.3 Special function register (SFR) area
Table 3-6 Special Function Register List in 3.2.3 Special Function Registers (SFRs)).
78K0/KE1 products incorporate the following RAMs.
On-chip peripheral hardware special function registers (SFRs) are allocated in the area FF00H to FFFFH (refer to
Caution Do not access addresses to which SFRs are not assigned.
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.
The internal expansion RAM can also be used as a normal data area similar to the internal high-speed RAM, as
well as a program area in which instructions can be written and executed.
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PD780131
PD780132
PD780133
PD780134
PD78F0134
PD780136
PD780138
PD78F0138
PD780131
PD780132
PD780133
PD780134
PD78F0134
PD780136
PD780138
PD78F0138
Part Number
Part Number
Table 3-4. Internal High-Speed RAM Capacity
Table 3-5. Internal Expansion RAM Capacity
CHAPTER 3 CPU ARCHITECTURE
512 × 8 bits (FD00H to FEFFH)
1024 × 8 bits (FB00H to FEFFH)
1024 × 8 bits (F400H to F7FFH)
User’s Manual U16228EJ2V0UD
Internal High-Speed RAM
Internal Expansion RAM
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