Datasheet

Section 14 A/D Converter
ADCMS31A_000020020300 Rev.4.00 Nov. 02, 2005 Page 203 of 304
REJ09B0143-0400
Section 14 A/D Converter
This LSI includes a successive approximation type 10-bit A/D converter that allows up to four
analog input channels to be selected. The block diagram of the A/D converter is shown in figure
14.1.
14.1 Features
• 10-bit resolution
• Four input channels
• Conversion time: at least 4.4 µs per channel (at 16 MHz operation)
• Two operating modes
 Single mode: Single-channel A/D conversion
 Scan mode: Continuous A/D conversion on 1 to 4 channels
• Four data registers
 Conversion results are held in a 16-bit data register for each channel
• Sample and hold function
• Two conversion start methods
 Software
 External trigger signal
• Interrupt request
 An A/D conversion end interrupt request (ADI) can be generated