Electronics America 4-Bit Single-Chip Microcomputer User's Manual

PREFACE
USER
This manual is intended for user engineers who wish to understand the µ PD75402A’s, 75P402’s functions and
design an application system using them.
OBJECTIVE
The objective of this manual is for the user to understand the µ PD75402A’s, 75P402’s hardware functions shown
below.
COMPOSITION
This manual is composed roughly of the following contents.
• General description
• Pin functions
• Internal block functions
• Interrupt
• Other internal peripheral functions
• Instruction functions
READING
The reader of this manual must have general knowledge of electricity, logic circuitry and microcomputers.
• Use as the µ PD75P402 manual
→This manual describes the
µ PD75402A as the representative model unless there are particular differences in
functions. If using it as the µ PD75P402 manual, the µ PD75402A should be read as the µ PD75P402.
• Checking an instruction function with a known mnemonic
→Appendix D. “Instructions Index (in Alphabetical Order)” should be used.
• Checking an instruction with an unknown mnemonic but with a roughly known function
→Check the instruction’s mnemonic in 9.2 “Instruction Set and Its Operation” and then check the function in 9.4
“Instruction Functions and Application”.
• Roughly understanding the
µ PD75402A’s, 75P402’s functions
→Follow the contents.
LEGEND
Data notation weight : High-order digit on the left, low-order digit on the right
Notation of active low : ××× (line over pin, signal name)
Memory map address : Upper__low order, lower__high order
* : Explanation of * in text
Note : Content to be read carefully
Remarks : Supplementary explanation of text
Numeric notation : Binary ... ×××× or ××××B
Decimal ... ××××
Hexadecimal ... ××××H