Overview Of 8/10-Bit A/D Converter - Fujitsu MB90480 Series Hardware Manual

CHAPTER 17 8/10-BIT A/D CONVERTER

17.1 Overview of 8/10-Bit A/D Converter

This section describes the features of the 8/10-bit A/D converter and provides its block
diagram.
■
Features of the 8/10-bit A/D converter
The 8/10-bit A/D converter features the following functions:
Conversion time: Minimum of 3.68 μs per channel
•
• Sampling time:
• RC-type sequential comparison conversion system with sample and hold circuit
• 8- or 10-bit resolution can be selected.
• Analog input by program via eight channels can be selected.
- Single conversion mode:
- Scan conversion mode:
- Continuous conversion mode: Conversion of the specified channels is performed
- Stop conversion mode:
When A/D conversion ends, an interrupt request for end of A/D conversion is generated to the
CPU. The occurrence of this interrupt enables the transfer of data resulting from A/D conversion
to memory by starting μDMAC. The converter is therefore suitable for continuous processing.
As the start source, either of software, external triggers (falling edge) and the timer (rising edge)
can be selected.
356
(92 machine cycles/machine clock at 25 MHz, with sampling time included)
Minimum of 1.92 μs per channel
(48 machine cycles/machine clock at 25 MHz)
Selection and conversion of a single channel
Several channels can be converted in succession.
A maximum of eight channels can be programmed.
repeatedly.
Pauses after conversion of one channel is completed and
stands by until next activation is triggered. (Conversion
starts can be synchronized)