Renesas RX Series User Manual

R01UH0823EJ0100 Rev.1.00 Page 1628 of 1823
Jul 31, 2019
RX23W Group 45. 12-Bit D/A Converter (R12DAA)
45.3.2 Notes on Using the Internal Reference Voltage as the Reference Voltage
When setting the DAVREFCR.REF[2:0] bits to 011b to use the internal reference voltage/AVSS0 as the reference
voltage, the VREF path needs to be discharged before selecting the voltage. The following shows the discharging
procedure.
(1) Write 000b to the REF[2:0] bits.
(2) Set the DADR0 register to 0000h and the DADR1 register to 0000h.
(3) Keep the state of step (2) for 10 μs (discharging).
(4) After discharging is completed, write 011b to the REF[2:0] bits and select the internal reference voltage/AVSS0.
(5) Set the DACR.DAOEm bit to 1 (m = 0, 1) and wait for the stabilization wait time (5 μs) of the internal reference
voltage.
(6) Write data to the DADRm register and start D/A conversion.
Figure 45.5 Procedure for Selecting the Internal Reference Voltage as the Reference Voltage
REF[2:0]
VREF path discharge
Internal reference voltage
stabilization wait time
10 µs 5 µs
D/A conversion
000b 011b
DADRm
0000h XXXXh
DAOEn
DAn
(analog output
signal)
Hi-Z
0 V
Setting of DADRm register
XXXXh

Renesas RX Series Specifications

General

Core	RXv1, RXv2, RXv3
Flash Memory	Up to 8 MB
RAM	Up to 1 MB
Operating Voltage	1.62V to 5.5V
Operating Temperature	-40°C to +85°C or +105°C
Package	BGA, LQFP
ADC Resolution	12-bit
DAC Resolution	12-bit
Communication Interfaces	SCI, SPI, I2C, USB, Ethernet, CAN
Architecture	32-bit
Security Features	Memory Protection Unit (MPU)