ATTINY817-MFR. datasheet(152/492 Pages) MICROCHIP

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20.3.3.5 Timer/Counter Commands

A set of commands can be issued by software to immediately change the state of the peripheral. These

commands give direct control of the UPDATE, RESTART, and RESET signals. A command is issued by

writing the respective value to the Command bit field (CMD) in the Control E register (TCA.CTRLESET).

An UPDATE command has the same effect as when an update condition occurs, except that the UPDATE

command is not affected by the state of the Lock Update bit (LUPD) in the Control E register

(TCA.CTRLE).

The software can force a restart of the current waveform period by issuing a RESTART command. In this

case the counter, direction, and all compare outputs are set to zero.

A RESET command will set all timer/counter registers to their initial values. A RESET can be issued only

when the timer/counter is not running (ENABLE=0 in TCA.CTRLA).

20.3.3.6 Split Mode - Two 8-Bit Timer/Counters

Split Mode Overview

To double the number of timers and PWM channels in the TCA, a Split Mode is provided. In this Split

Mode, the 16-bit timer/counter acts as two separate 8-bit timers, which each have three compare

channels for PWM generation. The split mode will only work with single slope down count. Split Mode

does not support Event action controlled operation.

Split Mode Differences to Normal Mode

•

Count

–

Down-count only

–

Timer/Counter counter high and low byte are independent (TCA.LCNT, TCA.HCNT)

•

Waveform generation

–

Single Slope PWM only (WGMODE=SINGLESLOPE in TCA.CTRLB)

•

Interrupt

–

No change for low byte Timer/Counter (TCA.LCNT)

–

Underflow interrupt for high byte Timer/Counter (TCA.HCNT)

–

No compare interrupt or flag for High-byte Compare n registers (TCA.HCMPn)

•

Event actions: Not compatible

•

Buffer registers and Buffer Valid flags: Unused

•

Temp register: Unused, 16-bit register of the Normal Mode are accessed as 8-bit 'TCA_H' and

'TCA_L', respectively.

ATtiny417/817

Datasheet Complete

DS40001901B-page 152

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