Application Note
R01AN6504EJ0100 Rev.1.00 Page
1
of 145
May 22.23
RX26T Group, RX23T Group
Differences Between the RX26T Group and the RX23T Group
Introduction
This application note is intended as a reference to points of difference in the peripheral functions, I/O
registers, and pin functions between the RX26T Group and RX23T Group, as well as a guide to key points to
consider when migrating between the two groups.
Unless specifically otherwise noted, the information in this application note applies to the 100-pin package
version of the RX26T Group and the 64-pin package version of the RX23T Group as the maximum
specifications. To confirm details of differences in the specifications of the electrical characteristics, usage
notes, and setting procedures, refer to the User’s Manual: Hardware for the products in question.
Target Device
RX26T Group, RX23T Group
RX26T Group, RX23T Group Differences Between the RX26T Group and the RX23T Group
R01AN6504EJ0100 Rev.1.00 Page
2
of 145
May 22.23
Contents
1. Comparison of Built-In Functions of RX26T Group and RX23T Group ..................................... 4
2. Comparative Overview of Specifications .................................................................................. 6
2.1 CPU ......................................................................................................................................................... 6
2.2 Operating Modes ..................................................................................................................................... 8
2.3 Address Space ........................................................................................................................................ 9
2.4 Resets ................................................................................................................................................... 10
2.5 Option-Setting Memory ......................................................................................................................... 11
2.6 Voltage Detection Circuit ....................................................................................................................... 13
2.7 Clock Generation Circuit ....................................................................................................................... 26
2.8 Low Power Consumption ...................................................................................................................... 31
2.9 Register Write Protection Function ........................................................................................................ 36
2.10 Interrupt Controller................................................................................................................................. 37
2.11 Buses ..................................................................................................................................................... 41
2.12 Data Transfer Controller ........................................................................................................................ 43
2.13 I/O ports ................................................................................................................................................. 45
2.14 Multi-Function Pin Controller ................................................................................................................. 49
2.15 Multi-Function Timer Pulse Unit 3 ......................................................................................................... 78
2.16 Port Output Enable 3 ............................................................................................................................. 82
2.17 8-bit Timer ............................................................................................................................................. 90
2.18 Compare Match Timer ........................................................................................................................... 92
2.19 Independent Watchdog Timer ............................................................................................................... 93
2.20 Serial Communications Interface .......................................................................................................... 96
2.21 I
2
C Bus Interface ................................................................................................................................. 100
2.22 Serial Peripheral Interface ................................................................................................................... 103
2.23 CRC Calculator .................................................................................................................................... 106
2.24 12-Bit A/D Converter ........................................................................................................................... 108
2.25 D/A Converter and 12-Bit D/A Converter ............................................................................................ 118
2.26 Comparator C ...................................................................................................................................... 119
2.27 Data Operation Circuit ......................................................................................................................... 122
2.28 RAM ..................................................................................................................................................... 124
2.29 Flash Memory ...................................................................................................................................... 125
2.30 Packages ............................................................................................................................................. 130
3. Comparison of Pin Functions ............................................................................................... 131
3.1 64-Pin Package ................................................................................................................................... 131
3.2 48-Pin Package ................................................................................................................................... 135
4. Important Information When Migrating Between MCUs ....................................................... 138
4.1 Notes on Pin Design ............................................................................................................................ 138
4.1.1 VCL Pin (External Capacitor) ............................................................................................................ 138