Timer

The GR5526 SoC has two instances of Timer module that is a 32-bit general-purpose timer. Since the Timer is in the MCU Subsystem domain, Timer interrupt is not available during sleep, and the running Timer will not prevent MCU from sleeping. In active mode, when Timer is started again after stopping, it will continue to count down from the stop time. The value of RELOAD register will not take effect until the end of the current cycle.

• Generate an interrupt when the 32-bit down counter reaches 0.
• The clock source of the Timer follows the system clock.
• Each timer module has an independent interrupt entry.
• Timer pauses when MCU is suspended.

• The Timer can generate an interrupt request signal when the 32-bit down counter reaches 0. The interrupt request is held until it is cleared by writing 1 to the INT_STAT register.
• If the Timer count reaches 0 and, at the same time, the software clears a previous interrupt status, the interrupt status is set to 1.
• When the value of the RELOAD register is configured to 0, no count and no interrupt are generated.
• The RELOAD value only represents the count-down number of timers. If you want to configure a specific duration (for example, µs, ms, or s), you need to use the following formula:
  $$\mathrm{Expect}\_\mathrm{time}\left(s\right)=\mathrm{RELOAD}/\mathrm{(SystemCoreClock-1)}$$

• If you need to start counting from the new RELOAD value immediately, you need to deinitialize the Timer first, and then initialize the Timer.