7.6.2 Reset
Pressing this button (SW3) will assert reset to the MIMXRT685-EVK, TFA9894 amplifiers, pSRAM and OctalSPI Flash. If you
want to route the i.MX RT685 reset control signal to the standard Arduino reset pin, install JP14.
The Debug Probe (LPC4322) is not reset when this button is pressed.
NOTE
7.6.3 PMIC-ON
Press and release to turn on the PMIC. Do not press down for more than three seconds.
7.7 ISP boot config
The ISP pins (
PIO1_15
,
PIO1_16
, and
PIO1_17
) select the boot source.
Table 9. Boot config
Boot mode
ISP2 pin
PIO1_17
ISP1 pin
PIO1_16
ISP0 pin
PIO1_15
Description
—
Low
Low
Low
Reserved
SDIO0 (SD Card)
Low
Low
High
Boot from a SD card
device connected to
SDIO 1 interface. The
RT6xx will look for a
valid image in the SD
card device. If there is
no valid image found,
the RT6xx will enter the
ISP boot mode based
on OTP
DEFAULT_ISP_MODE
bits
(6:4,
BOOT_CFG[0]
).
FlexSPI Boot from Port
B
Low
High
Low
Boot from Quad/Octal
SPI Flash devices
connected to the
FlexSPI interface 0 Port
B. The RT6xx will look
for a valide image in the
external Quad/Octal
SPI Flash device.
If there is no valid image
found, the RT6xx will
enter recovery boot or
ISP boot mode.
FlexSPI Boot from Port
A
Low
High
High
Boot from Quad/Octal
SPI Flash devices
connected to the
FlexSPI interface 0 Port
A. The RT6xx will look
for a valide image in the
Table continues on the next page...
NXP Semiconductors
On-board peripherals
i.MX RT685 Evaluation Board, Rev. 0, March 20 2020
User's Guide
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