Cypress F2MC-8FX Series Nota aplikacyjna - Strona 5
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2.4
NVR (Non-Volatile Register) Function
The NVR interface enables users to select hardware or software watchdog timer by modifying the 16-bit watchdog
timer selection ID. Please note that the watchdog timer selection ID cannot be modified while the CPU is running,
therefore please modify NVR in Flash Area first, then the MCU will copy these values to NVR interface (IO Area)
automatically after a reset.
Figure 4
shows the basic configuration of serial programming connection for flash memory products.
Please note that either the SWWDT or HWWDT can work at the same time. NVR is used to decide which one is
working.
These 16 bits of WDTH and WDTL are loaded from the flash address FFBE
are determined by the pre-loaded values in the NVR flash area.
Write certain values to the address FFBE
Table 1
shows watchdog timer selection ID.
Table 1. Watchdog Timer Selection ID
WDTH[7:0], WDTL[7:0]
A596
H
A597
H
Other than the above values
www.cypress.com
F²MC-8FX Family, MB95200H/210H Series Watchdog Timer
Figure 4. Retrieval of NVR during Reset
and FFBF
to select watchdog timer's mode.
H
H
The HWWDT is disabled and the SWWDT is enabled.
The HWWDT is selected and the SWWDT is disabled. [It can be stopped in one of
the standby modes (stop/sleep/timebase timer/watch mode).]
The WHWDT is selected and the SWWDT is disabled. [It keeps running in one of the
standby modes (stop/sleep/timebase timer/watch mode).]
Document No. 002-05336 Rev.*A
, FFBF
after a reset. The initial values
H
H
Function
4