UPD784938 Datasheet, PDF (417/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 16 A/D CONVERTER
(2) Scan mode 1 (bit 5 (SCMD) of A/D converter mode register (ADM) = 1)
When bit 5 of the ADM is set (to 1), the analog input pins specified by bits 1 to 3 (ANIS0 to ANIS2) are selected, and
subjected to conversion, in order. If an A/D conversion result register (ADCR) read is not performed by the CPU by
the end of the next A/D conversion after A/D conversion end (INTAD) generation, conversion is restarted without
performing INTAD generation, ADCR updating or channel updating (see Figure 16-10).
If an ADCR read is performed by the CPU before the end of the next A/D conversion, the same operation as in scan
mode 0 is performed.
Figure 16-10. Scan Mode 1 Operation Timing
Channel updating disabled
A/D conversion
ANI0
ANI1
ANI2
ANI2
ANI3
ANI0
ADCR
ANI0
ANI1
ADCR updating disabled
ANI2
ANI3
INTAD
Interrupt generation disabled
ADCR read
Preliminary User’s Manual U13987EJ1V0UM00
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