UPD78F0138 NEC, UPD78F0138 Datasheet - Page 260

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

A/D converter
operation
is reset (0) by software.
comparison mode register (PFM), or power-fail comparison threshold register (PFT) during an A/D conversion
operation, the conversion operation is initialized, and if the ADCS bit is set (1), conversion starts again from the
beginning.
260
A/D conversion operations are performed continuously until bit 7 (ADCS) of the A/D converter mode register (ADM)
If a write operation is performed to one of the ADM, analog input channel specification register (ADS), power-fail
RESET input makes the A/D conversion result register (ADCR) undefined.
INTAD
ADCR
SAR
Undefined
Sampling
Sampling time
Figure 12-8. Basic Operation of A/D Converter
CHAPTER 12 A/D CONVERTER
User’s Manual U16228EJ2V0UD
Conversion time
A/D conversion
Conversion
result
Conversion
result