32186 datasheet(505/1032 Pages) RENESAS

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A/D CONVERTER

11-7

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

A/D conversion interrupt or DMA transfer request

ADiIN0

Completed here when operating

in single-shot scan mode

ADiDT0

10-bit A/Di Data Register

Conversion

starts

(Note 1)

ADiIN1

ADiINn-1

ADiINn

ADiDT1

ADiDTn-1

ADiDTn

During continuous scan mode

<n-channel scan>

i= 0

n=0–15

Note 1: A/D0 conversion start: Software trigger

→ Started by setting the A/D0 conversion start bit to "1"

Hardware trigger

→ Started by input event bus 3, input event bus 2,

output event bus 3 or TIN23S signal input

Figure 11.1.4 Operation of A/D Conversion in Scan Mode

11.1 Outline of A/D Converter

Figure 11.1.3 Operation in Single Mode (Comparate)

(2) Scan Mode

In scan mode, the analog input voltages from channel 0 to the channel selected by the A/D Scan

Mode Register 1 scan loop select bit (channels 0–15) are sequentially A/D converted.

There are two types of scan mode: “Single-shot scan mode” in which A/D conversion is completed

after performing one cycle of scan operation, and “Continuous scan mode” in which scan operation is

continued until halted by setting the A/D scan mode register 0’s A/D conversion stop bit to "1."

These types of scan mode are selected using A/D Scan Mode Register 0. The channels to be

scanned are selected using A/D Scan Mode Register 1. The selected channels are scanned sequen-

tially beginning with channel 0.

An A/D conversion interrupt or DMA transfer request can be generated when one cycle of scan opera-

tion is completed.

A/D conversion interrupt

or DMA transfer request

Note 1: Comparate operation is started by writing a comparison value to the Successive

Approximation Register (ADiSAR)

ADiINn

Completed

ADiCMP

A/Di Comparate

Data Register

Conversion

starts

(Note 1)

ADiSAR

A/D Successive Approximation Register

Comparate result

ADiCMP=0 (ANn > ADiSAR)

ADiCMP=1 (ANn < ADiSAR)

i=0

n=0–15

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