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13.5.2
Continuous conversion mode
In the continuous conversion mode, A/D conversion is performed sequentially from the
start channel to the end channel.When A/D conversion for the end channel is
terminated, it is continued after returning to the start channel.
I Setting of Continuous Conversion mode
Operating the 8-/10-bit A/D converter in the continuous conversion mode requires the setting shown in
Figure 13.5-2.
ADCS
ADCR
ADER
: Unused
: Used bit
: Setting "1" to corresponding bit using as analog input pin
: Setting "1"
1
0
: Setting "0"
I Operation of Continuous Conversion Mode
• When the start trigger is input, A/D conversion starts from the channel set by the A/D conversion start
channel select bits (ANS2 to ANS0) and is performed continuously up to the channel set by the A/D
conversion end channel select bits (ANE2 to ANE0).
• When A/D conversion for the channel set by the A/D conversion end channel select bits (ANE2 to
ANE0) is terminated, it is continued after returning to the channel set by the A/D conversion start
channel select bits (ANS2 to ANS0).
• To terminate A/D conversion forcibly, write "0" to the A/D conversion-on flag bit in the A/D control
status register (ADCS: BUSY).
• This mode cannot be restarted during A/D conversion.
[When start and end channels are the same]
• If the start and end channels have the same channel number (ADCS: ANS2 to ANS0 = ADCS: ANE2 to
ANE0), A/D conversion for one channel set as the start channel (= end channel) is repeated.
Figure 13.5-2 Setting of Continuous Conversion mode
bit15 14 13 12 11 10
BUSY NT INTE
PAUS STS1
STS0
S10 ST1 ST0
CT1 CT0
CHAPTER 13 8/10-bit A/D converter
9 bit8 bit7 6
5
4
Re-
STRT
MD1 MD0 ANS2
ANS1 ANS0
served
0
1
0
D9 D0 (hold the conversion result)
3
2
1 bit0
ANE2
ANE1 ANE0
371
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