RH850/U2A 144pin 9. Precautions
R20UT5089ED0101 Rev.1.01 Page 39 of 56
July 08, 2022
9. Precautions
9.1 Power-Off Sequence
A dedicated sequence needs to be applied when power supply to the board is turned off.
Please follow the below sequence:
1. At first turn the RESET switch SW1 into '5-6 ON' position, so that RESET is permanently asserted.
Alternatively keep SW1 manually in' 5-4 (ON)' position.
2. Turn off the board power supply.
3. After the power supply has shut down, release RESET by returning SW1 into the 'OFF' position.
For details how to apply a RESET, please refer to section
6.2 RESET Switch.
9.2 CAN0RX is Shared with FLASH Programmer Signal FLMD1
When using this product plugged into a motherboard where CAN0 is connected to the CAN-
transceiver the FLASH programmer will not work.
This is because the CAN0RX function is shared with the FLMD1 function on the same device
PIN.
Most CAN-transceiver are driving the RX line actively and the FLASH programmer then is
not able to change signal level as required for flashing.
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