RL78/G1H CHAPTER 13 A/D CONVERTER
R01UH0575EJ0120 Rev. 1.20 Page 283 of 920
Dec 22, 2016
13.2 Configuration of A/D Converter
The A/D converter includes the following hardware.
(1) ANI0 to ANI2, ANI13, ANI14, and ANI19 pins
These are the analog input pins of the six channels of the A/D converter. They input analog signals to be
converted into digital signals. Pins other than the one selected as the analog input pin can be used as I/O port
pins.
(2) Sample & hold circuit
The sample & hold circuit samples each of the analog input voltages sequentially sent from the input circuit, and
sends them to the A/D voltage comparator. This circuit also holds the sampled analog input voltage during A/D
conversion.
(3) A/D voltage comparator
This A/D voltage comparator compares the voltage generated from the voltage tap of the comparison voltage
generator with the analog input voltage. If the analog input voltage is found to be greater than the reference
voltage (1/2 AV
REF) as a result of the comparison, the most significant bit (MSB) of the successive approximation
register (SAR) is set. If the analog input voltage is less than the reference voltage (1/2 AVREF), the MSB bit of the
SAR is reset.
After that, bit 8 of the SAR register is automatically set, and the next comparison is made. The voltage tap of the
comparison voltage generator is selected by the value of bit 9, to which the result has been already set.
Bit 9 = 0: (1/4 AV
REF)
Bit 9 = 1: (3/4 AVREF)
The voltage tap of the comparison voltage generator and the analog input voltage are compared and bit 8 of the
SAR register is manipulated according to the result of the comparison.
Analog input voltage ≥ Voltage tap of comparison voltage generator: Bit 8 = 1
Analog input voltage ≤ Voltage tap of comparison voltage generator: Bit 8 = 0
Comparison is continued like this to bit 0 of the SAR register.
When performing A/D conversion at a resolution of 8 bits, the comparison continues until bit 2 of the SAR
register.
Remark AV
REF: The + side reference voltage of the A/D converter. This can be selected from AVREFP, and
V
DD.
(4) Comparison voltage generator
The comparison voltage generator generates the comparison voltage input from an analog input pin.
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