Renesas RA Series Quick Design Guide

Renesas RA Family RA4 Quick Design Guide
R01AN5988EU0100 Rev.1.00 Page 12 of 51
Jul.21.21
3. MCU Operating Modes
The RA4 MCU series can enter one of two modes after reset: Single-chip mode or SCI/USB boot mode. The
boot mode is selected by the MD pin:
Table 6. Operating Modes Available at Reset
Operating Mode
MD
On-Chip Flash Memory
External Bus
Single-chip mode
1
Enable
Disable
SCI/USB boot mode
0
Enable
Disable
Figure 7 shows operating mode transitions as determined by the Mode-Setting (MD) pin.
Figure 7. Mode Setting Pin level and Operating Mode
A typical MCU boot mode circuit includes a jumper and a couple of resistors to allow selections to connect
the MD pin to VCC or Ground.
Figure 8. Typical Circuit for MCU Boot Mode Selection
4. Option Setting Memory
The option-setting memory determines the state of the MCU after a reset. It is allocated to the configuration
setting area and the program flash area of the flash memory. Option setting memory may be different in size
and layout for Arm Cortex-M33 based devices.

Renesas RA Series Specifications

General

Brand	Renesas
Model	RA Series
Category	Microcontrollers
Language	English