M32CSLASH86 datasheet(266/505 Pages) RENESAS

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18. A/D Converter

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18.1 Mode Description

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 18.2

lists specifications of one-shot mode.

Table 18.2 One-shot Mode Specifications

Item

Specification

Function

The CH2 to CH0 bits in the AD0CON0 register, the OPA1 and OPA0 bits in the

AD0CON1 register and the APS1 and APS0 bits in the AD0CON2 register select a

pin. Analog voltage applied to the pin is converted to a digital code once

Start Condition

• When the TRG bit in the AD0CON0 register is set to "0" (software trigger),

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

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

(after the ICTB2 register counter completes counting) is generated after the

ADST bit is set to "1" by program

Stop Condition

• A/D conversion is completed (the ADST bit is set to "0" when the software 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 pin from ANi0 to ANi7 (i=none, 0, 2, 15), ANEX0 or ANEX1

Reading of A/D Conversion Result • When the DUS bit in the AD0CON3 register is set to "0" (DMAC operating

mode disabled), the microcomputer reads the AD0j register (j=0 to 7) corre-

sponding to selected pin

• When the DUS bit is set to "1" (DMAC operating mode enabled), do not read the

AD00 register. A/D conversion result is stored in the AD00 register after the A/D

conversion is completed. DMAC transfers the conversion result to any memory

space. Refer to 13. DMAC for DMAC settings

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