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UPD780138 Datasheet(PDF) 59 Page - NEC

No. de Pieza. UPD780138
Descripción  8-Bit Single-Chip Microcontrollers
Descarga  558 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD780138 Datasheet(HTML) 59 Page - NEC

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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16228EJ2V0UD
59
3.1.2 Internal data memory space
78K0/KE1 products incorporate the following RAMs.
(1) Internal high-speed RAM
Table 3-4. Internal High-Speed RAM Capacity
Part Number
Internal High-Speed RAM
µPD780131
µPD780132
512
× 8 bits (FD00H to FEFFH)
µPD780133
µPD780134
µPD78F0134
µPD780136
µPD780138
µPD78F0138
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.
(2) Internal expansion RAM
Table 3-5. Internal Expansion RAM Capacity
Part Number
Internal Expansion RAM
µPD780131
µPD780132
µPD780133
µPD780134
µPD78F0134
µPD780136
µPD780138
µPD78F0138
1024
× 8 bits (F400H to F7FFH)
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.
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 3-6 Special Function Register List in 3.2.3 Special Function Registers (SFRs)).
Caution
Do not access addresses to which SFRs are not assigned.


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