39.6.2.4 Counter Mode

The counter mode is selected by the Mode bit group in the Control A register (CTRLA.MODE). By default, the counter is enabled in the 16-bit counter resolution. Three counter resolutions are available:
  • COUNT8: 8-bit counter mode
  • COUNT16: 16-bit counter mode
  • COUNT32: This mode is achieved by pairing two 16-bit TC peripherals

    When paired, the TC peripherals are configured using the registers of the even-numbered TC. The odd-numbered partner will act as a client, and the Client bit in the Status register (STATUS.SLAVE) will be set. The register values of a client will not reflect the registers of the 32-bit counter. Writing to any of the client registers will not affect the 32-bit counter. Normal access to the client COUNT and CCx registers is not allowed.

    Table 39-4. 32-bit Resolution Mode Support
    Timer Counter32-bit Resolution Mode
    TC0Yes: Host
    TC1Yes: Client to TC0
    TC2No