NEC PD750004 User Manual page 6

4 bit single-chip microcomputer
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Notation
Data bit significance
Active low
Memory map address
Note
Caution
Remark
Important and emphasized matter : Described in bold face
Numeric value
: Higher-order bits on the left side
Lower-order bits on the right side
: xxx (Pin and signal names are overscored.)
: Low-order address on the upper side
High-order address on the lower side
: Explanation of an indicated part of text
: Information requesting the user's special attention
: Supplementary information
: Binary .................. xxxx or xxxxB
Decimal ............... xxxx
Hexadecimal ....... xxxxH

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