FLASH-CAN-48P
Chapter 3 Jumpers and Switches
© Fujitsu Semiconductor Europe GmbH
- 17 -
UG-900002-20
3.10 Reset-Generation
(JP: 3, 4, 24, 35)
Additional to the internal Power-On-Reset the microcontroller can be reset by an external
Reset-circuit (Voltage-Monitor) and by the UART, too.
JP3, JP5
Select DTR- or RTS-
Line of UART”A” / UART”B” 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.
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 polarity of the DTR/RTS line can be invert by this jumper.
Remove the jumper in order to disable the reset logic.
Jumper
Setting
Description
JP3 (DTR / RTS “A”)
1-2
DTR of UAR
T”A” is selected
2-3
RTS of UART”A” is selected
JP5 (DTR / RTS “B”)
1-2
DTR of UART”B” is selected
2-3
RTS of UART”B” is selected
JP4 (UART”A”/”B”)
1-2
UART”A” is used to generate Reset
2-3
UART”B” is used to generate Reset
JP24 (Main Reset)
closed
external Reset generation is active
open
no external Reset generation
JP35 (Polarity)
1-2
No polarity inversion for the DTR/RTS signal
2-3
Polarity inversion for the DTR/RTS signal
Default: JP24 = closed (JP3, JP4, JP5 and JP35 are not set)
By default, the external Reset generation is active. 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, than JP4 together with 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.
