NEC PD754144 User Manual
Page 58
CHAPTER 3 FEATURES OF ARCHITECTURE AND MEMORY MAP
58
User’s Manual U10676EJ3V0UM
Figure 3-7.
µPD754244 I/O Map (7/8)
Hardware name (symbol)
Number of bits that
Bit
Address
R/W
can be manipulated
manipulation
Remarks
b3
b2
b1
b0
1-bit
4-bit
8-bit
addressing
FE0H
Unmounted
to
FE7H
FE8H
PM33
PM32
PM31
PM30
R/W
–
–
Port mode register group A (PMGA)
PM63
Note
PM62
Note
PM61
Note
PM60
Note
FEAH
Unmounted
to
FEDH
FEEH
–
–
–
PM8
Note
R/W
–
–
–
A write to an unmounted area is invalid, and
Port mode register group C (PMGC)
the read value is undefined.
–
–
–
–
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Note These are not registered as reserved words.
However, bit manipulation is possible by using 0FE9.0 to 0FE9.3.