M32CSLASH8A datasheet(277/372 Pages) RENESAS

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M32C/8A Group

18. A/D Converter

Rev.1.00

Jul 15, 2007

Page 260 of 352

REJ09B0385-0100

18.1.1

One-Shot Mode

In one-shot mode, analog voltage applied to a selected pin is converted to a digital code once. Table 18.4 lists

specifications of one-shot mode.

Table 18.4

One-Shot Mode Specifications

Item

Specification

Function

Analog voltage applied to a selected pin is converted once

Analog input pins

Select one pin from AN_0 to AN_7, AN15_0 to AN15_7, ANEX0, or ANEX1

The following register settings determine which pin is used:

• Bits CH2 to CH0 in the AD0CON0 register

• Bits OPA1 and OPA0 in the AD0CON1 register

• Bits APS1 and APS0 in the AD0CON2 register

Start Condition

Software trigger is selected. (TRG bit in the AD0CON0 register = 0):

• the ADST bit in the AD0CON0 register is set to 1 (A/D conversion starts)

External trigger, hardware trigger is selected (TRG bit = 1):

• TRG0 bit in the AD0CON2 register = 0

The falling edge is detected on the ADTRG pin after the ADST bit is set to 1

• TRG0 bit = 1

Timer B2 interrupt request of three-phase motor control timer function (after

the ICTB2 register completes counting) is generated after the ADST bit is set

to 1.

Stop condition

• A/D conversion is completed (the ADST bit becomes 0 when software trigger is

selected).

• Set the ADST bit to 0 by program (A/D conversion stops).

Interrupt request generation timing When the A/D conversion is completed

Read of A/D conversion result

• DMAC operating mode is not used (DUS bit in the AD0CON3 register = 0):

Read the AD0j register (j = 0 to 7) corresponding to a selected pin by program.

• DMAC operating mode is used (DUS bit = 1):

A/D conversion result is stored into the AD00 register after A/D conversion is

completed. Then, DMAC transfers the data from the AD00 register to a given

memory space. (Refer to 13. DMAC for DMAC settings)

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