Single Scan Mode; Basic Operation (Without Channel-Dedicated Sample-And-Hold Circuits) - Renesas RX100 Series User Manual

RX13T Group
26.3.2

Single Scan Mode

26.3.2.1

Basic Operation (Without Channel-Dedicated Sample-and-Hold Circuits)

In basic operation of single scan mode, A/D conversion is performed once on the analog input of the specified channels
as below.
(1) When the ADCSR.ADST bit is set to 1 (A/D conversion start) by software, or synchronous or asynchronous trigger
input, A/D conversion is performed for ANn channels selected by the ADANSA0 register, starting from the channel
with the smallest number n.
(2) Each time A/D conversion of a single channel is completed, the A/D conversion result is stored into the
corresponding A/D data register (ADDRy).
(3) When A/D conversion of all the selected channels is completed, a scan end interrupt request is generated if the
ADCSR.ADIE bit is 1 (interrupt generation upon scanning completion enabled).
(4) The ADCSR.ADST bit remains 1 (A/D conversion start) during A/D conversion, and is automatically cleared to 0
when A/D conversion of all the selected channels is completed. Then the 12-bit A/D converter enters a wait state.
A/D conversion
started
ADST
Channel 0
Waiting for conversion
(AN000)
Channel 1
Waiting for conversion
(AN001)
Channel 2
Waiting for conversion
(AN002)
ADDR0
ADDR1
ADDR2
Scan end
interrupt
Note 1. indicates the instruction is executed by software.
Figure 26.2 Example of Operation in Single Scan Mode (Basic Operation: AN000, AN001, AN002 Selected)
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
Scanning performed once
*1
Set
(1)
A/D conversion time
A/D conversion 1
A/D conversion 2
(2)
Stored
A/D conversion result 1
(2)
(4)
A/D conversion 3
Stored
A/D conversion result 2
(2) Stored
A/D conversion result 3
(3)
26. 12-Bit A/D Converter (S12ADF)
Waiting for conversion
Waiting for conversion
Waiting for conversion
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