CHAPTER 12 A/D CONVERTER
User’s Manual U16899EJ2V0UD
265
(11) A/D converter sampling time and A/D conversion start delay time
The A/D converter sampling time differs depending on the set value of the A/D converter mode register (ADM).
The delay time exists until actual sampling is started after A/D converter operation is enabled.
When using a set in which the A/D conversion time must be strictly observed, care is required for the contents
shown in Figure 12-21 and Table 12-3.
Figure 12-21. Timing of A/D Converter Sampling and A/D Conversion Start Delay
ADCS
Wait
period
Conversion time
Conversion time
A/D
conversion
start delay
time
Sampling
time
Sampling timing
INTAD
ADCS
←
1 or ADS rewrite
Sampling
time
Table 12-3. A/D Converter Sampling Time and A/D Conversion Start Delay Time (ADM Set Value)
A/D Conversion Start Delay Time
Note
FR2 FR1 FR0
Conversion
Time
Sampling
Time
MIN. MAX.
0 0 0
288/f
X
40/f
X
32/f
X
36/f
X
0 0 1
240/f
X
32/f
X
28/f
X
32/f
X
0 1 0
192/f
X
24/f
X
24/f
X
28/f
X
1 0 0
144/f
X
20/f
X
16/f
X
18/f
X
1 0 1
120/f
X
16/f
X
14/f
X
16/f
X
1 1 0
96/f
X
12/f
X
12/f
X
14/f
X
Other than above
Setting prohibited
−
−
−
Note The A/D conversion start delay time is the time after wait period. For the wait function, see CHAPTER 32
CAUTIONS FOR WAIT.
Remark f
X
: High-speed system clock oscillation frequency
(12) Register generating wait cycle
Do not read data from the ADCR register and do not write data to the ADM, ADS, PFM, and PFT registers while
the CPU is operating on the subsystem clock and while high-speed system clock oscillation is stopped.
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