upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 226

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

226
Note The time from the rising of the ADCE bit to the rising of the ADCS bit must be 14 s or longer to stabilize the
Cautions 1. A/D conversion must be stopped before rewriting bits FR0 to FR2 to values other than the
Remark
reference voltage.
Note Data of first conversion cannot be used.
Boost reference voltage
ADCS
2. For the sampling time of the A/D converter and the A/D conversion start delay time, see (11)
3. If data is written to ADM, a wait cycle is generated. Do not write data to ADM when the CPU is
f
X
0
0
1
1
: High-speed system clock oscillation frequency
identical data.
in 11.6 Cautions for A/D Converter.
operating on the subsystem clock and the high-speed system clock is stopped. For details,
see CHAPTER 30 CAUTIONS FOR WAIT.
Figure 11-4. Timing Chart When Boost Reference Voltage Generator Is Used
ADCE
ADCE
ADCS
0
1
0
1
Stop status (DC power consumption path does not exist)
Conversion waiting mode (only reference voltage generator consumes power)
Conversion mode (reference voltage generator operation stopped
Conversion mode (reference voltage generator operates)
Table 11-2. Settings of ADCS and ADCE
Note
Boost reference voltage generator: operating
CHAPTER 11 A/D CONVERTER
Conversion
operation
User’s Manual U16961EJ4V0UD
Conversion
A/D Conversion Operation
waiting
Conversion
operation
Conversion stopped
Note
)