CHAPTER 10 A/D CONVERTER
Preliminary User’s Manual U16846EJ1V0UD
186
Table 10-2. Settings of ADCS and ADCE
ADCS ADCE
A/D
Conversion Operation
0
0
Stop status (DC power consumption path does not exist)
0
1
Conversion waiting mode (only reference voltage generator consumes power)
1
0
Conversion mode (reference voltage generator operation stopped
Note
)
1
1
Conversion mode (reference voltage generator operates)
Note Data of first conversion cannot be used.
Figure 10-4. Timing Chart When Boost Reference Voltage Generator Is Used
ADCE
Boost reference voltage
ADCS
Conversion
operation
Conversion
operation
Conversion stopped
Conversion
waiting
Boost reference voltage generator: operating
Note
Note The time from the rising of the ADCE bit to the falling of the ADCS bit must be 14
µ
s or longer to stabilize
the reference voltage.
Cautions 1. A/D conversion must be stopped before rewriting bits FR0 to FR2 to values other than the
identical data.
2. For the sampling time of the A/D converter and the A/D conversion start delay time, see (11)
in 10.6 Cautions for A/D Converter.
3. If data is written to ADM, a wait cycle is generated. For details, see CHAPTER 25 CAUTIONS
FOR WAIT.
Remark f
X
: High-speed system clock oscillation frequency