Atmel AT91SAM9263-EK User Manual page 40

Warning
Figure 6-1. BMS Signal Sampling
SLCK
MCK
Backup Supply
(VDDBU)
POR output
backup_nreset
processor_nreset
NRST
(nrst_out)
BMS_PB3/AC97RX
Workaround:
At the first VDDBU power up or if this power supply has been shut down (J4-1 opened
(VDDBU/VDDBACKUP Jumper) or the CR1225 battery cell (J3) removed or changed), the following
power-up sequence has to be applied in order to boot out of the internal ROM:
1. Close J2 to force power on
2. Open J5 (Boot Mode Select Jumper)
3. Power on the board
4. Remove and replace J4-1 (VDDBU/VDDBACKUP Jumper)
6-2
6341B–ATARM–17-Sep-08
Startup Time
Processor Startup
= 3 cycles
EXTERNAL RESET LENGTH
= 2 cycles
BMS signal sampling
AT91SAM9263-EK Evaluation Board Rev. B User Guide
Any
Freq.