Renesas H8SX/1668R - Manual (Page 21)

Chapter 7. Modes
This RSK supports two Boot modes and Single Chip mode.
Details of programming the FLASH memory is described in the H8SX/1668R Group Hardware Manual.
7.1. Boot mode
The boot mode settings for this RSK are shown in Table 7-1: Boot Mode pin settings below:
EMLE MD2 MD1 MD0 PM2 LSI State after Reset End
0 0 1 0 0 SCI boot mode
0 0 1 0 1 USB boot mode
Table 7-1: Boot Mode pin settings
The software supplied with this RSK supports debugging with E10A which does not need Boot mode. To enter the Boot mode manually, do
not connect the E10A in this case. Press and hold the SW1/BOOT. The BOOT LED will be illuminated to indicate that the microcontroller is
in boot mode.
SCI boot mode: boot mode executes programming/erasure of the user MAT or user boot MAT by means of the control command and
program data transmitted from the externally connected host via the on-chip SCI_4.
USB boot mode: executes programming/erasing of the user MAT by means of the control command and program data transmitted from the
externally connected host via the USB.
7.2. Singe chip mode
This is default operating mode of this RSK. Refer to H8SX/1668R Group Hardware Manual for details of Single chip mode. The Single chip
mode settings for this RSK are shown in Table 7-2: Single chip mode pin settings below:
EMLE MD2 MD1 MD0 LSI State after Reset End
0 1 1 1 Single chip Mode
Table 7-2: Single chip Mode pin settings
Programming/erasure of the user MAT is executed by downloading an on-chip program. The user boot MAT cannot be
programmed/erased in user program mode.
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