UPD784938 Datasheet, PDF (412/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 16 A/D CONVERTER
(h) When comparison of the 8 bits is completed, a valid digital result is left in the SAR, and that value is transferred
to the A/D conversion result register (ADCR) and latched.
An A/D conversion operation end interrupt request (INTAD) can be generated at the same time.
Figure 16-6. Basic A/D Converter Operation
Sampling time
A/D converter
operation
Sampling
SAR
Undefined 80H
C0H
or
40H
ADCR
Conversion time
A/D conversion
Conversion
result
Conversion
result
INTAD
A/D conversion operations are performed successively until the CS bit is cleared (to 0) by software. If a write operation
is performed on the ADM during an A/D conversion operation, the conversion operation is initialized, and if the CS bit is
set (to 1), conversion will be started from the beginning.
The contents of the ADCR are undefined after RESET input.
412
Preliminary User’s Manual U13987EJ1V0UM00