UPD784938 Datasheet, PDF (421/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 16 A/D CONVERTER
(1) Select mode A/D conversion operation
An A/D conversion operation is started on the analog input pin set by the A/D converter mode register (ADM). As soon
as the A/D conversion operation ends, another A/D conversion operation is performed on the same analog input pin.
An A/D conversion end interrupt request (INTAD) is generated at the end of each A/D conversion operation.
If a valid edge is input to the INTP5 pin during an A/D conversion operation, the A/D conversion operation being
performed at that time is suspended, and a new A/D conversion operation is started.
Figure 16-13. Hardware Start Select Mode A/D Conversion Operation
INTP5 pin input
(rising edge valid)
A/D conversion
Standby state ANIn ANIn ANIn ANIn ANIn Standby state ANIm ANIm
ADM rewrite
CS ← 1, TRG ← 1
ADCR
ANIn
ANIn
ADM rewrite
CS ← 1, TRG ← 1
ANIn
ANIm
INTAD
Remark n = 0, 1, …, 7
m = 0, 1, …, 7
INTAD acknowledgment
(2) Scan mode A/D conversion operation
When conversion operation is started, an A/D conversion operation is started on the ANI0 pin input. When the A/D
conversion operation ends, an A/D conversion operation is started on the next analog input pin. An A/D conversion
end interrupt request (INTAD) is generated at the end of each A/D conversion operation.
If a valid edge is input to the INTP5 pin during an A/D conversion operation, the A/D conversion operation being
performed at that time is suspended, and a new A/D conversion operation is started on the ANI0 pin input.
Preliminary User’s Manual U13987EJ1V0UM00
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