UPD78F1502AGK-GAK-AX Datasheet, PDF (450/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
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CHAPTER 13 VOLTAGE REFERENCE (μ PD78F150xA only)
CHAPTER 13 VOLTAGE REFERENCE (μ PD78F150xA only)
13.1 Function of Voltage Reference
The voltage reference is mounted onto all 78K0R/Lx3 microcontroller products. The Voltage Reference has the
following modes.
• Reference voltage output mode
A reference voltage is output from the VREFOUT pin. Furthermore, the generated reference voltage is supplied to the
internal A/D and D/A converters. 2.0 V (TYP.) or 2.5 V (TYP.) can be selected as the output voltage.
13.2 Configuration of Voltage Reference
The voltage reference consists of the following hardware.
Table 13-1. Configuration of Voltage Reference
Item
Reference voltage output
Control registers
Configuration
VREFOUT pin
Peripheral enable registers 0 (PER0)
Analog reference voltage control register (ADVRC)
Figure 13-1. Block Diagram of Voltage Reference
Positive reference voltage of A/D converter and D/A converter
VREFOUT/AVREFP
Voltage reference
circuit
VRSEL VRGV VRON
Analog reference voltage control
register (ADVRC)
Internal bus
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011