Microcontroller Mode Switch And Function Switch - Fujitsu FM3 family User Manual

7.1.4.2

Microcontroller Mode Switch and Function Switch

The microcontroller has the following two modes, which can be switched by external
jumper socket.
（１） Serial writer mode
（２） User mode
This section contains an overview of the two modes and a description of the setting
method.
（１） Serial writer mode
[Overview]
Built-in flash serial programming of the microcontroller mounted on the microcontroller board
can be carried out.
For details, see the "Flash Programming Manual" of the microcontroller.
[Setting Method]
Insert the jumper for switching modes of the microcontroller in the silk notation "MD0H" side.
The Operating Mode off the microcontroller is decided after releasing power on reset,
low-voltage detection reset and INITX pin input reset.
When selecting this mode, set to USB function by switching to USB function function of the
microcontroller.
Figure 29 Method of Setting Software Writing Mode
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