UPD78F1502AGK-GAK-AX Datasheet, PDF (433/1031 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)
(10) A/D conversion result register (ADCR, ADCRH) read operation
When a write operation is performed to A/D converter mode register (ADM), A/D converter mode register 1 (ADM1),
analog input channel specification register (ADS), and A/D port configuration register (ADPC), the contents of ADCR
and ADCRH may become undefined. Read the conversion result following conversion completion before writing to
ADM, ADM1, ADS, or ADPC. Using a timing other than the above may cause an incorrect conversion result to be
read.
(11) Internal equivalent circuit
The equivalent circuit of the analog input block is shown below.
Figure 10-30. Internal Equivalent Circuit of ANIn Pin
R1
ANIn
C1
C2
Table 10-8. Resistance and Capacitance Values of Equivalent Circuit (Reference Values)
R1
11.5 kΩ
C1
8.0 pF
C2
8.0 pF
Remarks 1. The resistance and capacitance values shown in Table 10-8 are not guaranteed values.
2. 78K0R/LF3: n = 0 to 6, 15, 78K0R/LG3, 78K0R/LH3: n = 0 to 10, 15
(12) Rewriting DACSWn during A/D conversion
Rewriting DACSWn (n = 0, 1) during A/D conversion is prohibited when both the positive reference voltage of A/D
converter (ADREFP) and the positive reference voltage of the D/A converter (DAREFP) are the voltage reference output
(VREFOUT) (VRSEL = 1 and DAREF = 1). Rewrite it when conversion operation is stopped (ADCS = 0).
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011