SK-96320-80PMC User Guide
Chapter 3 Jumpers and Switches
FMEMCU-UG-960010-11
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© Fujitsu Microelectronics Europe GmbH
3.13 Reset-Generation
(JP: 3, 4, 5, 7, 24, 35)
In addition to the internal Power-On reset, the microcontroller can be reset by an external
reset circuit (Voltage Monitor) and also by a RS232 interface.
JP3, JP5
As well the DTR-line as the RTS-Line of UART”A” or UART”B” can be used
to generate a system reset.
JP4
This jumper selects whether the DTR/RTS line from UART”A” or UART”B”
will generate a system reset.
JP7
This solder jumper selects between normal (immediate) reset and delayed reset.
In delayed reset mode, the reset button has to be held down for 2 sec before a
reset is generated to avoid accidental resets.
JP24
Open this jumper if no external Reset shall be generated.
In this case only the internal reset is active (e.g.: power-on)
JP35
The signal on the DTR/RTS line can be negated with this jumper.
Remove the jumper in order to disable the RS232 reset circuit.
Jumper
Setting
Description
1-2
DTR of UART”A” is selected
JP3 (DTR / RTS “A”)
2-3
RTS of UART”A” is selected
1-2
UART”A” is used to generate Reset
JP4 (UART”A”/”B”)
2-3
UART”B” is used to generate Reset
1-2
DTR of UART”B” is selected
JP5 (DTR / RTS “B”)
2-3
RTS of UART”B” is selected
1-2
Reset is applied immediately when SW6 is pressed
JP7
(Reset imm./delayed)
2-3
Reset is applied when SW6 is pressed >2sec
Closed
External Reset generation is active
JP24 (Main Reset)
Open No
external
Reset
generation
1-2
No negation for the DTR/RTS signal
JP35 (Polarity)
2-3
DTR/RTS signal is negated
Default: JP24 is closed; JP3, JP4, JP5 and JP35 are open
By default, the external reset is enabled and set to immediate reset, the reset by UART is
disabled.
Note:
While a reset signal is asserted the red Reset-LED D14 is lit.
During normal operation, this LED should be off!
If JP35 (Polarity) is set, JP4 and either JP3 or JP5 have to be set, too.
If the reset LED is steadily on, check the power supply input voltage and the settings for the
reset-generation by UART.
