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User’s Manual U11302EJ4V0UM
CHAPTER 3 CPU ARCHITECTURE
3.1 Memory Space
Each product of the
µ
PD780208 Subseries accesses a memory space of 64 KB. Figures 3-1 to 3-5 show memory
maps.
Caution The initial values of the internal memory size switching register (IMS) in the
µ
PD780204A,
780205A, and 78P0208 are fixed to CFH, regardless of the internal memory capacity. Therefore,
set the values shown below for each product before use.
µ
PD780204A: C8H
µ
PD780205A: CAH
µ
PD78P0208: Value corresponding to mask ROM version
Figure 3-1. Memory Map (
µ
PD780204 and
µ
PD780204A)
0000H
Data memory
space
Internal ROM
32768 x 8 bits
7FFFH
1000H
0FFFH
0800H
07FFH
0080H
007FH
0040H
003FH
0000H
CALLF entry area
CALLT table area
Program area
Program area
Internal high-speed RAM
1024 x 8 bits
Reserved
Reserved
Program
memory
space
8000H
7FFFH
FFFFH
General-purpose
registers
32 x 8 bits
Special-function
registers (SFRs)
256 x 8 bits
Vector table area
FA30H
FA2FH
VFD display RAM
80 x 8 bits
FA80H
FA7FH
FAC0H
FABFH
Buffer RAM
64 x 8 bits
FB00H
FAFFH
FEE0H
FEDFH
FF00H
FEFFH
Содержание mPD780208 Subseries
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