Chapter 12 10-Bit A/D Converter; Overview Of The 10-Bit A/D Converter - Fujitsu MB91319 Series Hardware Manual

CHAPTER 12 10-BIT A/D CONVERTER

12.1

Overview of the 10-Bit A/D Converter

The 10-bit successive approximation A/D converter has two operation modes:
conversion start by software and conversion start by external trigger.
■ Features of the 10-Bit A/D Converter
Conversion time: 8.5 µs (sampling: 6.4 µs, conversion: 2.1 µs) when fch is @20 MHz
•
• A/D conversion result register available for each channel
• Channel scan function
■ Block Diagram
Figure 12.1-1 shows the configuration diagram of the 10-bit A/D converter, and Figure 12.1-2
shows its block diagram.
Figure 12.1-1 Configuration Diagram of the 10-Bit A/D Converter
AN0 to AN9
AN9
AN8
AN7
AN6
AN5
AN4
AN3
AN2
AN1
AN0
240
From pin
Figure 12.1-2 Block Diagram of the 10-Bit A/D Converter
D/A Converter
S/H
External pin
ATRG
A/D
ATRG
BUFFER x 10
Comparator
Control Logic
A/D
ch & Status
Control Logic
IRQ
IRQ