CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U17260EJ3V1UD
59
(2) Internal expansion RAM
Table 3-5. Internal Expansion RAM Capacity
Part Number
Internal Expansion RAM
µ
PD78F0531
µ
PD78F0532
µ
PD78F0533
−
µ
PD78F0534 1024
×
8 bits (F400H to F7FFH)
µ
PD78F0535 2048
×
8 bits (F000H to F7FFH)
µ
PD78F0536 4096
×
8 bits (E800H to F7FFH)
µ
PD78F0537, 78F0537D
6144
×
8 bits (E000H 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.
The internal expansion RAM cannot be used as a stack memory.
3.1.4 Special function register (SFR) area
On-chip peripheral hardware special function registers (SFRs) are allocated in the area FF00H to FFFFH (see
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.
3.1.5 Data memory addressing
Addressing refers to the method of specifying the address of the instruction to be executed next or the address of
the register or memory relevant to the execution of instructions.
Several addressing modes are provided for addressing the memory relevant to the execution of instructions for the
78K0/KE2, based on operability and other considerations. For areas containing data memory in particular, special
addressing methods designed for the functions of special function registers (SFR) and general-purpose registers are
available for use. Figures 3-9 to 3-15 show correspondence between data memory and addressing. For details of
each addressing mode, see
3.4 Operand Address Addressing
.
Содержание 78K/0 Series
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