Renesas RL78/G1H, User Manual

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RL78/G1H CHAPTER 13 A/D CONVERTER
R01UH0575EJ0120 Rev. 1.20 Page 290 of 920
Dec 22, 2016
Note These are the numbers of clock cycles when conversion is with 10-bit resolution. When eight-bit resolution is selected,
the values are shorter by two cycles of the conversion clock (f
AD
).
Caution 1. The A/D conversion time must also be within the relevant range of conversion times (t
CONV
) described in 31.6.1
A/D converter characteristics
Caution 2. Rewrite the FR2 to FR0, LV1 and LV0 bits to other than the same data while conversion is stopped (ADCS = 0,
ADCE = 0).
Caution 3. The above conversion time does not include conversion state time. Conversion state time add in the first
conversion. Select conversion time, taking clock frequency errors into consideration.
Remark f
CLK
:
CPU/peripheral hardware clock frequency
Table 13 - 3 A/D Conversion Time Selection (1/4)
(1) When there is no A/D power supply stabilization wait time Normal mode 1, 2
(software trigger mode/hardware trigger no-wait mode)
A/D Converter Mode
Register 0 (ADM0)
Mode Conversion
Clock (f
AD
)
Number of
Conversion
Clock Note
Conversion
Time
Conversion Time at 10-Bit Resolution
2.7 V ≤ V
DD
≤ 3.6 V
FR2 FR1 FR0 LV1 LV0 f
CLK
=
1 MHz
f
CLK
=
4 MHz
f
CLK
=
8 MHz
f
CLK
=
16 MHz
f
CLK
=
32 MHz
0 0 0 0 0 Normal
1
f
CLK
/64 19 f
AD
(number of
sampling clock:
7 f
AD
)
1216/f
CLK
Setting
prohibited
Setting
prohibited
Setting
prohibited
76 μ s 38 μ s
0 0 1 f
CLK
/32 608/f
CLK
76 μ s 38 μ s 19 μ s
0 1 0 f
CLK
/16 304/f
CLK
76 μ s 38 μ s 19 μ s 9.5 μ s
0 1 1 f
CLK
/8 152/f
CLK
38 μ s 19 μ s 9.5 μ s 4.75 μ s
1 0 0 f
CLK
/6 114/f
CLK
28.5 μ s 14.25 μ s 7.125 μ s 3.5625 μ s
1 0 1 f
CLK
/5 95/f
CLK
95 μ s 23.75 μ s 11.875 μ s 5.938 μ s 2.9688 μ s
1 1 0 f
CLK
/4 76/f
CLK
76 μ s 19 μ s 9.5 μ s 4.75 μ s 2.375 μ s
1 1 1 f
CLK
/2 38/f
CLK
38 μ s 9.5 μ s 4.75 μ s 2.375 μ s Setting
prohibited
0 0 0 0 1 Normal
2
f
CLK
/64 17 f
AD
(number of
sampling clock:
5 f
AD
)
1088/f
CLK
Setting
prohibited
Setting
prohibited
Setting
prohibited
68 μ s 34 μ s
0 0 1 f
CLK
/32 544/f
CLK
68 μ s 34 μ s 17 μ s
0 1 0 f
CLK
/16 272/f
CLK
68 μ s 34 μ s 17 μ s 8.5 μ s
0 1 1 f
CLK
/8 136/f
CLK
34 μ s 17 μ s 8.5 μ s 4.25 μ s
1 0 0 f
CLK
/6 102/f
CLK
25.5 μ s 12.75 μ s 6.375 μ s 3.1875 μ s
1 0 1 f
CLK
/5 85/f
CLK
85 μ s 21.25 μ s 10.625 μ s 5.3125 μ s 2.6563 μ s
1 1 0 f
CLK
/4 68/f
CLK
68 μ s 17 μ s 8.5 μ s 4.25 μ s 2.125 μ s
1 1 1 f
CLK
/2 34/f
CLK
34 μ s 8.5 μ s 4.25 μ s 2.125 μ s Setting
prohibited