Technical information

Chapter 7.Modes
The CPU board can be configured in User mode and Boot mode. User mode may be used to run and debug user code, while Boot mode
may only be used to program the Renesas microcontroller with program code via the USB or SCI4 interface. Further details of
programming the flash are available in the H8SX/1664 device hardware manual.
Note: Please note that, jumper ‘J15’ needs to be fitted in order to use the E10A debugger.
The CPU board provides the capability of changing between User and Boot / User Boot modes using a simple latch circuit. This
is only to provide a simple mode control on this board when the E10A debugger is not in use.
To manually enter 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.
More information on the operating modes can be found in the device hardware manual.
7.1.1. Boot mode
The boot mode settings for this CPU board are shown in belowTable 7-1 :
MD2 MD1
MD0 LSI State after Reset
End
0 1 0 Boot Mode
Table 7-1: Mode pin settings
7.1.2. User Mode
The H8SX/1664 supports four user modes. The memory map in all of these modes is 16Mbyte in size. The default user mode for CPU
board supporting H8SX/1664 is mode 7.
MD2 MD1
MD0 LSI State after Reset
End
1 1 1 User Mode
Table 7-2: Mode pin settings
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