Mitsubishi Electric M32R Series User Manual page 506

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

(2) Scan mode

In scan mode, analog input voltages in multiple selected channels (4, 8, or 16 channels) are

sequentially A-D converted.

There are two types of scan modes: "Single-shot scan mode" in which A-D conversion is

completed by performing one cycle of scan operation, and "Continuous scan mode" in which

scan operation is continued until halted by setting the Scan Mode Register A-D conversion stop

These types of scan modes are selected using Scan Mode Register 0. The channels to be

scanned are selected using Scan Mode Register 1. The number of channels and the sequence to

be scanned can be selected from three combinations available: 4, 8, or 16 channels. Channels

ADiIN0 to ADiIN3 (i = 0, 1) are used for 4-channel scan. Similarly, channels ADiIN0 to ADiIN7 and

channels ADiIN0 to ADiIN15 are used for 8-channel scan and 16-channel scan, respectively.

An A-D conversion interrupt request or a DMA transfer request (for the A-D0 converter only) can

be generated at completion of one cycle of scan operation.

<4-channel scan>

10-bit A-Di data register

Note 1: A-D0 conversion start: Software trigger → Started by setting A-D0 conversion start bit to 1

A-D1 conversion start: Software trigger → Started by setting A-D1 conversion start bit to 1

Note 2: DMA transfer request: Can be generated for only the A-D0 converter.

Figure 11.1.5 Operation of A-D Conversion in Scan Mode (for 4-channel Scan)

During continuous scan mode

A-D conversion interrupt request or DMA transfer request (Note 2)

Hardware trigger → Started by output event bus 3 or ADTRG signal input

Hardware trigger → Started by TID1 overflow/underflow or ADTRG signal input

11.1 Outline of A-D Converters

A-D CONVERTERS

Completed here when

operating in single-shot

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