Jumpers and Switches
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
| Jumper |
| Setting |
|
| Description |
|
| JP52 |
| ON (closed) |
| Reset is connected to FlexRay CC RST |
| |
|
| OFF (open) |
| No connection to the FlexRay CC | |||
|
|
|
| ||||
| JP54 |
| ON (closed) |
| Reset is connected to MCU INITX |
| |
|
| OFF (open) |
| No connection to the MCU | |||
|
|
|
| ||||
| JP96 |
|
| Reset is generated when SW1 is pressed |
| ||
|
|
| Reset is generated after SW1 is pressed 2s | ||||
|
|
|
|
Default: grey
The triple supply monitor
JP42 Monitoring of 1.8V supply voltage JP43 Monitoring of 2.5V supply voltage
| Jumper |
| Setting |
|
| Description |
|
|
| JP42 |
| ON (closed) |
| Vcc1V8 connected to supply monitor | |||
|
| OFF (open) |
|
| Vcc1V8 not connected to supply monitor |
|
| |
|
|
|
|
|
|
| ||
| JP43 |
| ON (closed) |
| Vcc2V5 connected to supply monitor |
| ||
|
| OFF (open) |
| Vcc2V5 not connected to supply monitor | ||||
|
|
|
|
Default: grey
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
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