User manual

Chapter 7. Modes

The Renesas Starter Kit supports Boot mode and Single chip mode.

Details of programming the FLASH memory is described in the R8C/38C Group Hardware Manual.

This circuit is not required on customer’s boards as it is intended for providing easy evaluation of the operating modes of the device on the

RSK.

To manually enter the Boot mode, press and hold the SW1/BOOT. The mode pins are held in their boot states while reset is pressed and

released. Release the boot button. The BOOT LED will be illuminated to indicate that the microcontroller is in boot mode.

Reset

Boot

Bootn

Td = 34msec

Time (msec)

1- Press and Hold SW1/Boot switch

2- Press and Hold Reset switch

3- Release Reset switch

4- Release SW1/Boot switch

Boot Procedure

RSKR8C38C Boot Sequence

tm = Time in msec during the Reset switch is pressed.

td = Reset time in msec for the Renesas reset chip

after Reset switch released

Boot mode

activated

Note:

Please note that the Reset signal is also acting as CLK signal for

the U4. CLK signal logic is inverted using TR1 on the schematics.

Inverted CLK signal for U4

using TR1

Figure 7-1: RSKR8C38C Boot Sequence

When neither the E8a is connected nor the board is placed in Boot mode, the MODE pin is pulled high by a 4.7k resistor.

When an E8a is used the MODE pin is controlled by the E8a.

More information on the operating modes and programming the flash memory can be found in the R8C/38C Group hardware manual.

7.1. Boot modes

The Boot mode settings for this Renesas Starter Kit are shown in Table 7-1 below:

Mode LSI State after Reset End

Low Boot Mode

Table 7-1: Boot Mode pin settings