Renesas RA Series Quick Design Guide

Renesas RA Family RA4 Quick Design Guide
R01AN5988EU0100 Rev.1.00 Page 2 of 51
Jul.21.21
5.10 External Clock Input .............................................................................................................................. 20
6. Reset Requirements and the Reset Circuit ............................................................................ 21
6.1 Pin Reset ............................................................................................................................................... 22
6.2 Power-On Reset .................................................................................................................................... 22
6.3 VBATT-Selected Voltage Power-On Reset ........................................................................................... 22
6.4 Independent Watchdog Timer Reset ..................................................................................................... 23
6.5 Watchdog Timer Reset .......................................................................................................................... 23
6.6 Voltage-Monitoring Resets .................................................................................................................... 23
6.7 Deep Software Standby Reset .............................................................................................................. 23
6.8 Software Reset ...................................................................................................................................... 23
6.9 Other Resets ......................................................................................................................................... 23
6.10 Determination of Cold/Warm Start ........................................................................................................ 23
6.11 Determining the Reset Source .............................................................................................................. 24
7. TrustZone Support ................................................................................................................. 24
7.1 Implementation of Arm TrustZone Technology ..................................................................................... 24
7.2 Emulator Support for TrustZone ............................................................................................................ 26
7.2.1 Device Lifecycle Management ............................................................................................................ 28
8. Memory ................................................................................................................................. 29
8.1 SRAM .................................................................................................................................................... 30
8.2 Standby SRAM ...................................................................................................................................... 30
8.3 Peripheral I/O Registers ........................................................................................................................ 31
8.4 On-Chip Flash Memory ......................................................................................................................... 31
8.4.1 Background Operation ........................................................................................................................ 32
8.4.2 ID Code Protection .............................................................................................................................. 32
8.4.3 Flash Block Protection ......................................................................................................................... 33
8.4.4 Memory Protection Unit ....................................................................................................................... 33
8.5 Restriction on Endianness ..................................................................................................................... 34
9. Register Write Protection ....................................................................................................... 34
10. I/O Port Configuration ........................................................................................................... 35
10.1 Multifunction Pin Selection Design Strategies ....................................................................................... 35
10.2 Setting Up and Using a Pin as GPIO .................................................................................................... 36
10.2.1 Internal Pull-Ups .................................................................................................................................. 37
10.2.2 Open-Drain Output .............................................................................................................................. 37
10.2.3 Drive Capacity ..................................................................................................................................... 37
10.3 Setting Up and Using Port Peripheral Functions ................................................................................... 38
10.4 Setting Up and Using IRQ Pins ............................................................................................................. 39
10.5 Unused Pins .......................................................................................................................................... 40
10.6 Nonexistent Pins .................................................................................................................................... 41

Renesas RA Series Specifications

General

Brand	Renesas
Model	RA Series
Category	Microcontrollers
Language	English