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Purpose
Configuration
Guidance
Notation
Related Document
PREFACE
This manual is intended for engineers who need to be familiar with the capability
μ
of the
PD720231 in order to develop application systems based on it.
The purpose of this manual is to help users understand the hardware capabilities
μ
(listed below) of the
PD720231.
This manual consists of the following chapters:
• Overview
• Pin functions
• Endpoint configuration
• USB descriptor information
• External Serial ROM information
• General Purpose I/O
• Security features
• How to Connect to External Elements
Readers of this manual should already have a general knowledge of electronics,
logic circuits, and microcomputers.
This manual uses the following conventions:
Data bit significance:
Active low:
Note:
Caution:
Remark:
Numerical value:
Use this manual in combination with the following document.
The related documents indicated in this publication may include preliminary
versions. However, preliminary versions are not marked as such.
μ
•
PD720231 Data Sheet: R19DS0073E
High-order bits on the left side;
Low-order bits on the right side
XXXXB (Pin and signal names are suffixed with B.)
Explanation of an indicated part of text
Information requiring the user's special attention
Supplementary information
Binary ... xxxx or xxxxb
Decimal ... xxxx
Hexadecimal ... xxxxh
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