nPM1300 General Purpose Timer

RE: nPM1300 General Purpose Timer

andychess — Fri, 30 Jan 2026 07:08:15 GMT

Hi Benjamin,

Thanks for clarifying that.

Rgds,

Andy

RE: nPM1300 General Purpose Timer

Benjamin — Thu, 29 Jan 2026 09:01:10 GMT

Hi,
It is to read if the boot monitor is enabled or disabled. In the case of a firmware update you may want to check if the boot monitor is disabled. From the docs:

After a power-on reset, the default timer is boot monitor and this is disabled. When enabled, it allows an automatic power cycle if the host does not set bit TASK.TIMER.DIS within t_BOOT.

Host software can enable the boot monitor with bit BOOT.TIMER.EN. It can disable the boot monitor to prevent interference with firmware updates. When enabled, the boot monitor remains enabled even if the chip is reset, except for a power-on reset. Removing both VBAT and VBUS, or clearing the BOOT.TIMER.EN bit, deactivates the timer during the next power-up.

Regards,
Benjamin

RE: nPM1300 General Purpose Timer

andychess — Tue, 27 Jan 2026 08:23:31 GMT

Hi Benjamin,

We figured that might be the case but couldn't workout exactly what influenced the register. What exactly is the purpose of the register and when would we need it?

Best regards,
Andy

RE: nPM1300 General Purpose Timer

Benjamin — Mon, 26 Jan 2026 11:18:09 GMT

Hi Andrew,

The TIMERSTATUS boot monitor bit indicates that the boot monitor has been requested. It does not indicate that the general-purpose timer is running. Unfortunately, there is no status bit available that reflects the timer’s running state.

Regards,
Benjamin