Operation Modes

The ADC supports six different operation modes, with differential and single-ended conversions possible for each mode. This is configured in the Command (ADCn.COMMAND) register.

The operation modes can be split into three groups:

Single mode - Single conversion per trigger, with 8- or 12-bit conversion output
Series Accumulation mode - One conversion per trigger, with an accumulation of n samples
Burst Accumulation mode - A burst with n samples accumulated as fast as possible after a single trigger

Series and Burst modes utilize 12-bit conversions and can be configured with or without scaling of the accumulated result. The number of samples to accumulate is controlled by the SAMPNUM bit in the Control F (ADCn.CTRLF) register. The accumulator is always reset to zero when a new Series or Burst accumulation is started.

The table below shows an overview of the available operation modes.

Table 1. Operation Modes
Operation Mode	COMMAND Mode	Conversions Per Trigger	Accumulation Type	RESULT Update
Single 8-bit	0	1	N/A	Every conversion
Single 12-bit	1	1	N/A	Every conversion
Series Accumulation	2	1	Full	After SAMPNUM conversions
Series Accumulation with Scaling	3	1	Scaled	After SAMPNUM conversions
Burst Accumulation	4	SAMPNUM	Full	After SAMPNUM conversions
Burst Accumulation with Scaling	5	SAMPNUM	Scaled	After SAMPNUM conversions

ATtiny1624/1626/1627

Operation Modes