11 reset generation, Reset generation – FUJITSU MB91460 SERIES User Manual
Page 36
SK-91F467-FLEXRAY V1.1
Jumpers and Switches
FMEMCU-UG-910017-11
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© Fujitsu Microelectronics Europe GmbH
3.11 Reset Generation
A system reset can be generated in different ways. The first possibility is to press the user
reset push button (SW1). Secondly the supply monitor will generate a reset if an unusual
voltage is detected and third a reset is raised if a UART that does a reset is selected.
If a system reset is done, it will be displayed by the red reset LED (D18).
The system reset will do a simultaneous reset of the microcontroller and the FlexRay
communication controller. The MCU and / or the FlexRay CC can be disconnected from the
system reset signal with two jumpers.
The Reset push button can be used in two modes:
•
no delay of Reset
•
press Reset button 2s
The selection is done by solder Jumper JP96.
JP52 Connects the FlexRay CC to the system reset signal (SK91F467-FLEXRAY)
JP54 Connects the MCU to the system reset signal
Jumper
Setting
Description
ON (closed)
Reset is connected to FlexRay CC RST
JP52
OFF (open)
No connection to the FlexRay CC
ON (closed)
Reset is connected to MCU INITX
JP54
OFF (open)
No connection to the MCU
1-2
Reset is generated when SW1 is pressed
JP96
2-3
Reset is generated after SW1 is pressed 2s
Default: grey
Table 3-22: Reset Connections
The triple supply monitor on-board has the possibility to watch 5V, 3.3V and the third voltage
is user configurable 2.5V or 1.8V. If any voltage has a failure, a system reset will be done.
JP42 Monitoring of 1.8V supply voltage
JP43 Monitoring of 2.5V supply voltage
Jumper
Setting
Description
ON (closed)
Vcc1V8 connected to supply monitor
JP42
OFF (open)
Vcc1V8 not connected to supply monitor
ON (closed)
Vcc2V5 connected to supply monitor
JP43
OFF (open)
Vcc2V5 not connected to supply monitor
Default: grey
Table 3-23: Supply Monitor Settings
By default 2.5V supply will be monitored.
The system reset also can be done via any UART. Therefore the user has the possibility to
select one of the three on-board UARTs.