TN0108

Clocks (including RTC)

Doc ID 15874 Rev 2

21/26

7.3

RTC operation through non-destructive reset

On Cut 1.1 devices, when a non-destructive reset (for example a functional reset or

watchdog reset) is issued, the RTC (real-time clock) is reset.

On Cut 2 devices, the clocking circuitry has been changed so that the RTC will continue to

run and keep time through a non-destructive reset.

7.4

External 32 kHz oscillator

On Cut 1.1 devices, there was a fault, which prevented the 32 kHz external oscillator from

functioning. This has been fixed on Cut 2 devices so an external 32 kHz oscillator can be

used. For a list of devices that have been qualified to function correctly, consult the device

reference manual and datasheet.

Table 21.

RTC operation through non-destructive reset

Silicon revision

RTC behavior

Implications

SPC560B Cut 1.1

RTC is reset

Loss of time keeping

SPC560B Cut 2

RTC continues to run

No loss of time keeping