upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 230

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

230
Note The time from the rising of the ADCE bit to the falling of the ADCS bit must be 14
Cautions 1. A/D conversion must be stopped before rewriting bits FR0 to FR2 to values other than the
the 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
0
0
1
1
identical data.
in 12.6 Cautions for A/D Converter.
operating on the subsystem clock and the high-speed system clock is stopped. For details,
see CHAPTER 31 CAUTIONS FOR WAIT.
Figure 12-4. 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 12-2. Settings of ADCS and ADCE
Note
Boost reference voltage generator: operating
CHAPTER 12 A/D CONVERTER
Conversion
operation
User’s Manual U16962EJ3V0UD
Conversion
A/D Conversion Operation
waiting
Conversion
operation
Conversion stopped
Note
µ
s or longer to stabilize
)