UPD78F1502AGK-GAK-AX Datasheet, PDF (420/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 10 12-BIT A/D CONVERTER (μ PD78F150xA),
10-BIT A/D CONVERTER (μ PD78F151xA)
Cautions 1. Make sure the period of <4> to <8> is 1 μs or more.
2. To use an operational amplifier output for an analog input, start operating the operational
amplifier before setting the A/D conversion operation (see CHAPTER 12 OPERATIONAL
AMPLIFIER). Furthermore, do not change the operational amplifier setting during the A/D
conversion operation.
3. To use an output voltage of the voltage reference for a positive reference voltage of A/D
converter, start operating the voltage reference before setting the A/D conversion operation (see
CHAPTER 13 VOLTAGE REFERENCE). Furthermore, do not change the voltage reference setting
during the A/D conversion operation.
4. When using the A/D converter in normal mode 2 (LV1 = 0, LV0 = 1) or low voltage mode (LV1 = 1,
LV0 = 0), enable the input gate voltage boost circuit for the A/D converter by using the analog
reference voltage control register (ADVRC), and then set ADCE and ADCS to 1. After the voltage
boost circuit stabilization time (10 μs) passes after the input gate voltage boost circuit for the A/D
converter has been enabled, set ADCS to 1.
Remark
Two types of A/D conversion result registers are available.
conversion result register (ADCR, ADCRH) to 0000H or 00H.
• ADCR (16 bits): Store 12-bit A/D conversion value
• ADCRH (8 bits): Store 8-bit A/D conversion value
Reset signal generation clears the A/D
Figure 10-16. Basic Operation of A/D Converter
Sampling time
Conversion time
A/D converter
operation
Sampling
A/D conversion
SAR ^Undefined
ADCR
Conversion
result
Conversion
result
INTAD
R01UH0004EJ0501 Rev.5.01
404
Jun 20, 2011