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3.1 Memory Spaces
µ PD780024AS, 780034AS Subseries can access 64 KB memory space respectively.
Figures 3-1 to 3-5 show memory maps.
Caution
In case of the internal memory capacity, the initial value of memory size switching register (IMS)
of all products ( µ PD780024AS, 780034AS Subseries) is fixed (CFH). Therefore, set the value
corresponding to each products indicated below.
µ PD780021AS, 780031AS: 42H
µ PD780022AS, 780032AS: 44H
µ PD780023AS, 780033AS: C6H
µ PD780024AS, 780034AS: C8H
µ PD78F0034BS:
FFFFH
FF00H
FEFFH
FEE0H
FEDFH
FD00H
FCFFH
Data memory
space
2000H
1FFFH
Program
memory
space
0000H
CHAPTER 3 CPU ARCHITECTURE
Value for mask ROM version
Figure 3-1. Memory Map ( µ PD780021AS, 780031AS)
Special function
registers (SFRs)
256 × 8 bits
General-purpose
registers
32 × 8 bits
Internal high-speed RAM
512 × 8 bits
Reserved
Internal ROM
8192 × 8 bits
Preliminary User's Manual U16035EJ1V0UM
1FFFH
Program area
1000H
0FFFH
CALLF entry area
0800H
07FFH
Program area
0080H
007FH
CALLT table area
0040H
003FH
Vector table area
0000H
43
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