RL78/F13, F14 CHAPTER 13 D/A CONVERTER (RL78/F14 Only)
R01UH0368EJ0210 Rev.2.10 773
Dec 10, 2015
13.4 Operations of D/A Converter
13.4.1 Operation in Normal Mode
D/A conversion is performed using write operation to the DACS0 register as the trigger.
The setting method is described below.
<1> Set the DACEN bit of the peripheral enable register 1 (PER1) to 1 to start the supply of the input clock to the
D/A converter.
<2> Use the A/D port configuration register (ADPC) to set the ports to analog pins.
<3> Set the ANO0EN bit of the D/A converter mode register 2 (DAM2) to 1 (analog output enable). When setting
bits 5 and 4 (CVRS1 and CVRS0) in the comparator I/O select register (CMPSEL) to 10B (internal reference
voltage (DAC output) is selected), set the ANO0EN bit in this register to 0 (analog output is disabled).
<4> Set the DAMD0 bit of the D/A converter mode register (DAM) to 0 (normal mode).
<5> Set the analog voltage value to be output to the ANO0 pin to the D/A conversion value setting register 0
(DACS0).
Steps <1> to <5> above constitute the initial settings.
<6> Set the DACE0 bit of the DAM register to 1 (D/A conversion enable).
D/A conversion starts, and then, after the settling time elapses, the analog voltage set in step <5> is output to
the ANO0 pin.
<7> To perform subsequent D/A conversions, write to the DACS0 register.
The previous D/A conversion result is held until the next D/A conversion is performed.
When the DACE0 bit of the DAM register is set to 0 (D/A conversion operation stop), D/A conversion stops.
If the ports are set to digital pins using the ADPC register, the ANO0 pin goes into a high-impedance state when the
PM80 bit of the PM8 register for the port = 1 (input mode), and the ANO0 pin outputs the set value of the P8 register when
the PM80 bit = 0 (output mode).
Cautions 1. Even if 1, 0, and then 1 is set to the DACE0 bit, there is a wait after 1 is set for the last time.
2. If the DACS0 register is rewritten during the settling time, D/A conversion is aborted and
reconversion by using the newly written values starts.
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