LAUNCHXL-CC1352R1: watchdog timer的clock來源?

Hugh

sdk:simplelink_cc13xx_cc26xx_sdk_6_10_00_29

請問watchdog timer的clock來源是從哪裡來的? 是RTC嗎?

在datasheet上面看到watchdog timer是1.5MHz clock rate, 這個是從哪一個clock source來的? (SCLK_HF?SCLK_MF?SCLK_LF?)

"The watchdog timer runs on a 1.5 MHz clock rate and cannot be stopped once enabled. The watchdog timer pauses to run in Standby power mode and when a debugger halts the device."

3 年多前

0 Nick Sun 3 年多前

TI__Genius 15940 points

您好，

收到您的问题了，我们升级到英文论坛给工程师看下，有答复尽快给到您。

+1 Nick Sun 3 年多前

TI__Genius 15940 points

您好，

从文档SWCU185E(CC13x2, CC26x2 SimpleLink Wireless MCU Technical Reference Manual): https://www.ti.com/lit/ug/swcu185e/swcu185e.pdf?ts=1661307320327&ref_url=https%253A%252F%252Fe2e.ti.com%252F可以了解到相应信息：

The WDT is running off the INFRASTRUCTURE clock sourced by the MCU Power, Reset, and Clock Management (PRCM) module.
...MCU_AON has two clocks, an INFRASTRUCTURE clock that always runs and a PERBUSULL clock that is identical to the INFRASTRUCTURE clock whenever the SYSBUS clock is running...INFRASTRUCTURE and PERBUSULL clocks are automatically controlled to run at a maximum of half the clock frequency of SCLK_HF, regardless of the settings in PRCM:INFCLKDIVR.RATIO, PRCM:INFCLKDIVS.RATIO, or PRCM:INFCLKDIVDS.RATIO.
5.2.3 Scaler to WDT
There is a scaler with a fixed-division ratio of 32 of the MCU clock that is present. Regardless of the settings
in the PRCM:INFCLKDIVR, the PRCM:INFCLKDIVS, and the PRCM:INFCLKDIVDS registers, the watchdog
counts at a constant speed.

所以1.5 MHz是来自 48 MHz (HF)去除以 32。

希望能够帮助到您。

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LAUNCHXL-CC1352R1: watchdog timer的clock來源?