M32CSLASH8B datasheet(280/406 Pages) RENESAS

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M32C/8B Group

18. A/D Converter

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 263 of 385

18.1.5

Repeat Sweep Mode 1

In repeat sweep mode 1, analog voltage applied to eight pins, prioritizing one to four pins, is repeatedly

converted to a digital code.

Table 18.8 lists specifications of repeat sweep mode 1.

Table 18.8

Repeat Sweep Mode 1 Specification

Item

Specification

Function

Analog voltage applied to 8 selected pins, prioritizing one to four pins, is

repeatedly converted.

Analog input pins

ANi_0 to ANi_7 (8 pins are selected from these pins) (i = none, 0, 2, 15)

Prioritized pins

Select one of the following.

• single pin (ANi_0)

• 2 pins (ANi_0 and ANi_1)

• 3 pins (ANi_0 to ANi_2)

• 4 pins (ANi_0 to ANi_3)

The following register settings determine which pins are used:

• Bits SCAN1 and SCAN0 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

Set the ADST bit is set to 0 (A/D conversion stops)

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

Interrupt request is not generated.

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

Interrupt request is generated every time each A/D conversion is completed.

Reading A/D conversion result

• DMAC operating mode is not used (DUS bit = 0):

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

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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