User manual

...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 681
www.energymicro.com
• Programmable scan sequence
• Up to 8 configurable samples in scan sequence
• Mask to select which pins are included in the sequence
• Triggered by software or PRS input
• One shot or repetitive mode
• Oversampling available
• Overflow interrupt flag set when overwriting unread results
• Conversion tailgating support for predictable periodic scans
• Programmable single conversion
• Triggered by software or PRS input
• Can be interleaved between two scan sequences
• One shot or repetitive mode
• Oversampling available
• Overflow interrupt flag set when overwriting unread results
• Hardware oversampling support
• 1st order accumulate and dump filter
• From 2 to 4096 oversampling ratio (OSR)
• Results in 16-bit representation
• Enabled individually for scan sequence and single sample mode
• Common OSR select
• Individually selectable voltage reference for scan and single mode
• Internal 1.25V reference
• Internal 2.5V reference
• V
DD
• Internal 5 V differential reference
• Single ended external reference
• Differential external reference
• Unbuffered 2xV
DD
• Support for offset and gain calibration
• Interrupt generation and/or DMA request
• Finished single conversion
• Finished scan conversion
• Single conversion results overflow
• Scan sequence results overflow
• Loopback configuration with DAC output measurement
28.3 Functional Description
An overview of the ADC is shown in Figure 28.1 (p. 682) .