TPMC533 User Manual Issue 1.0.1
Page 92 of 107
7 Operating Modes
The ADC Mode Registers and the DAC Mode Registers determine whether an ADC (all eight ADC Channels
of the corresponding ADC) or a DAC (all four DAC Channels of the corresponding DAC) operate in "Manual
Mode" or in "Sequencer Mode".
Manual Mode
7.1
In Manual Mode, analog-to-digital conversions and digital-to-analog conversions are requested by software
commands (there is no periodic conversion rate).
ADC Data is only read manually from ADC Data Registers and DAC Data, that shall be converted, is only
written manually to DAC Data Registers.
For the DACs there are two different ways of performing manual digital-to-analog conversions: "Immediate
Conversion" and "Controlled Conversion".
7.1.1 DAC Immediate Conversion
If set to Immediate Conversion, a DAC Channel is updated immediately after a DAC Data transfer. Writing to
the DAC Data Registers transfers the data to the DACs and also initiates the analog output update
afterwards. The DACx Busy bits in the Global DAC Status Register may be used as an indication whether
the analog output update is already completed.
"Immediate Conversion" is the most simple conversion mode. However, it is not suitable for simultaneous
digital-to-analog conversions.
7.1.2 DAC Controlled Conversion
If set to Controlled Conversion, the four DAC Channels of a DAC are updated simultaneously by a write to
the Global DAC Control Register. Writing to the DAC Data Registers does not automatically initiate an
analog output update.
As the Conversion Request bits of all DACs are combined in the Global DAC Control Register, all DAC
Channels of the TPMC533 can perform their digital-to-analog conversions simultaneously. Of course, DAC
Data must have been written to DAC Data Registers before.