M32C83T datasheet(257/527 Pages) RENESAS

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Page 234

17. A/D Converter

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17.1 Mode Description

17.1.1 One-shot Mode

In one-shot mode, analog voltage applied to a selected pin is converted to a digital code once. Table 17.4

lists specifications of one-shot mode.

Table 17.4 One-shot Mode Specifications

Item

Specification

Function

Analog voltage, applied to a pin selected by the CH2 to CH0 bits in the ADiCON0

Start Condition

When the TRG bit in the ADiCON0 register is set to "0" (software trigger),

• The ADST bit in the ADiCON0 register is set to "1" (A/D conversion starts) by

program

• The PST bit in the AD0CON2 register is set to "1" (A/D0 and A/D1 start a

conversion simultaneously) by program

When the TRG bit is set to "1" (external trigger, hardware trigger),

__________

• A falling edge is applied to the ADTRG pin after the ADST bit is set to "1" by

program

• One of the following interrupt requests is generated after the ADST bit is set to

"1" by program:

- The timer B2 interrupt request of three-phase motor control timer functions

(after the ICTB2 counter completes counting) is generated

- The intelligent I/O interrupt request is generated

Channel 1 in the group 2 (A/D0), channel 1 in the group 3 (A/D1)

Stop Condition

• A/D conversion is completed (the ADST bit is set to "0" when the internal trigger is

selected)

• The ADST bit is set to "0" (A/D conversion stopped) by program

Interrupt Request Generation Timing A/D conversion is completed

Analog Voltage Input Pins

Select one from AN0 to AN7, ANEX0, or ANEX1

Select one from ANj0 to ANj7 (j=0, 2, 15)

Reading of A/D Conversion Result

The ADik register (k=0 to 7) corresponding to selected pin

17.1.2 Repeat Mode

In repeat mode, analog voltage applied to a selected pin is repeatedly converted to a digital code. Table

17.5 lists specifications of repeat mode.

Table 17.5 Repeat Mode Specifications

Item

Specification

Function

Analog voltage, applied to a pin selected by the CH2 to CH0 bits in the ADiCON0

Start Condition

Same as one-shot mode

Stop Condition

The ADST bit in the ADiCON0 register is set to "0" (A/D conversion stopped) by

program

Interrupt Request Generation Timing Not generated

Analog Voltage Input Pins

Select one from AN0 to AN7, ANEX0, or ANEX1

Select from ANj0 to ANj7 (j=0, 2, 15)

Reading of A/D Conversion Result The ADik register (k=0 to 7) corresponding to selected pins

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