Rev. 5.00, 12/03, page 517 of 1088
Section 14 A/D Converter
(8 Analog Input Channel Version)
14.1
Overview
The chip incorporates a successive-approximations type 10-bit A/D converter that allows up to
eight analog input channels to be selected.
14.1.1
Features
A/D converter features are listed below
•
10-bit resolution
•
Eight input channels
•
Settable analog conversion voltage range
Conversion of analog voltages with the reference voltage pin (V
ref
) as the analog reference
voltage
•
High-speed conversion
Minimum conversion time: 6.7
µ
s per channel (at 20 MHz operation)
•
Choice of single mode or scan mode
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
•
Three kinds of conversion start
Choice of software or timer conversion start trigger (TPU or 8-bit timer), or
ADTRG
pin
•
A/D conversion end interrupt generation
A/D conversion end interrupt (ADI) request can be generated at the end of A/D conversion
The data transfer controller (DTC) can be activated for data transfer by an interrupt
•
Module stop mode can be set
As the initial setting, A/D converter operation is halted. Register access is enabled by
exiting module stop mode
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