RL78/G10 CHAPTER 10 A/D CONVERTER
R01UH0384EJ0311 Rev. 3.11 257
Dec 22, 2016
10.7 A/D Converter Setup Flowchart
The A/D converter setup flowchart is described below.
10.7.1 Setting up A/D conversion of voltages on ANI0 to ANI6
Figure 10-15. Setting Up A/D Conversion of Voltages on ANI0 to ANI6
Start of setup
The ADCEN bit of the PER0 register is set (1), and a clock is provided to the A/D converter.
The ports (ANI0 to ANI6
Note1
) to be A/D converted are set to analog input.
•
Set the bits in the PMC0 and PM0 registers to 1.
The conversion time and each mode of the A/D converter are set.
•
A/D converter mode register 0 (ADM0)
FR1, FR0, and LV0 bits: These bits are used to select the A/D conversion time.
•
A/D converter mode register 2 (ADM2)
ADTYP bit: This bit is used to select 10-bit or 8-bit resolution.
•
Analog input channel specification register (ADS)
ADS2
Note2
, ADS1, and ADS0 bits:
These bits are used to select ANI0 to ANI6
Note 1
as the target of A/D conversion.
The operation of the A/D voltage comparator is started.
The stabilization wait time (0.1
µ
s) is counted by the software.
•
The ADCE bit of the ADM0 register is set (1),
and the system enters the conversion standby status.
A/D conversion ends. The conversion result is stored in the ADCRH and ADCRL registers.
•
A/D conversion result higher-order bit storage register (ADCRH): Eight higher-order bits
•
A/D conversion result lower-order bit storage register (ADCRL): Two lower-order bits
At the same time, the A/D conversion end interrupt request signal (INTAD) is generated,
and the ADCS bit of the ADM0 register is automatically cleared (0) (conversion standby status).
After counting up to the stabilization wait time ends, the ADCS bit of the ADM0
register is set (1) and A/D conversion starts.
End
Setting PER0 register
Setting PMC0 and PM0 registers
•
Setting ADM0 register
•
Setting ADM2 register
•
Setting ADS register
(The order of the settings
is irrelevant.)
Setting ADCE bit
A/D conversion operation
End of A/D conversion
Storage of conversion results
in the ADCRH and ADCRL
registers
Setting ADCS bit
A/D voltage stabilization
wait time count
Notes 1. For 10-pin products, ANI0 to ANI3.
2. 16-pin products only.
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