NXP Semiconductors KITFS85SKTEVM, Руководство пользователя, Страница: 32 / 50

NXP Semiconductors
UM11183
KITFS85SKTEVM evaluation board
UM11183 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved.
User guide Rev. 2.0 — 20 February 2019
32 / 50
7.2.1 Example script: Closing initialization phase, disabling FCCU monitoring
and releasing FS0b
The following script can be used to:
•
Disable the WD (simple WD configuration is used here).
• Disable the FCCU monitoring.
On the hardware kit, the FCCU1 is pulled to GND and FCCU2 is pulled to VDDIO,
which is detected as error phase by default. Disabling the FCCU by SPI/I2C avoids
safety issue at startup.
• Close the initialization phase.
• Exit the Debug mode.
• Release FS0b pin. This is valid only if WD is activated in OTP.
Seven good consecutive WD answers are required to have the FLT_ERR_CNTR back
to 0. This is one of the conditions to allow FS0b release.
Table 18. FS85 starting sequence example
Step Register name Value Description
1 FS_WD_WINDOW 0x0200 WDW_WINDOWS[3:0] = 0x0 => Watchdog disabled
2 FS_NOT_WD_WINDOW 0xF50F NOT of FS_WD_WINDOW
3 FS_I_SAFE_INPUTS 0x51C6 FCCU_CFG[1:0] = 0x0 => 0x1 => Monitoring by pair
FCCU12_FLT_POL[0] = 1 => FCCU1 or 2 = 0 is a fault
4 FS_I_NOT_SAFE_INPUTS 0xAC18 NOT of FS_I_SAFE_INPUTS
5 FS_WD_ANSWER 0x5AB2 1st good WD answer (for simple WD selection in OTP)
Close the initialization phase
6 FS_STATES 0x4000 DBG_EXIT[0]=1 => Exit Debug mode
7 FS_WD_ANSWER 0x5AB2 2nd good WD answer
8 FS_WD_ANSWER 0x5AB2 3rd good WD answer
9 FS_WD_ANSWER 0x5AB2 4th good WD answer
10 FS_WD_ANSWER 0x5AB2 5th good WD answer
11 FS_WD_ANSWER 0x5AB2 6th good WD answer
12 FS_WD_ANSWER 0x5AB2 7th good WD answer
13 FS_RELEASE_FS0B 0xB2A5 FS0b pin released (pulled to high level)
14 MFLAG2 0x40F1 Clear flags VSUPUV7; VPREUVL, VSUPUVL, WAKE1FLG
15 FS_OVUVREG_STATUS 0x4550 Clear UV status flags
This sequence can be sent using a script built with FlexGUI. See Section 8.3.2 "Script
sequence files" .
7.3 Programming the device with an OTP configuration
The device configuration can be changed three times (see Section 4.2.1 "OTP and
mirrors registers" ). The programming steps are exactly the same as the OTP emulation
mode up to step 6.
Then, the user has to burn the part with FlexGUI. See
Section 8.4.8 "OTP programming" .
Follow the instructions on the screen to proceed.