Jumpers and Switches
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
| 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
Table 3-22: Reset Connections
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
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
- 36 - | © Fujitsu Microelectronics Europe GmbH |