M32CSLASH8A datasheet(284/372 Pages) RENESAS

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M32C/8A Group

18. A/D Converter

Rev.1.00

Jul 15, 2007

Page 267 of 352

REJ09B0385-0100

18.1.7

Multi-Port Repeat Sweep Mode 0

In multi-port repeat sweep mode 0, analog voltage that is applied to 16 selected pins is repeatedly converted to

a digital code. Set the DUS bit in the AD0CON3 register to 1 (DMAC operating mode enabled).

Table 18.10 lists specifications of multi-port repeat sweep mode 0.

Table 18.10

Multi-Port Repeat Sweep Mode 0 Specifications

Item

Specification

Function

Analog voltage applied to the 16 selected pins is repeatedly converted in the

following order: AN_0 to AN_7

→ AN15_0 to AN15_7

Analog input pins

• AN_0

→ AN_1 → . . . → AN_7 → AN15_0 → AN15_1→ . . . → AN15_7

The following register settings determine which pins are used:

Bits MPS11 and MPS10 in the AD0CON4 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 An interrupt request is generated every time each A/D conversion is completed

(Set the DUS bit in the AD0CON3 register to 1)

Read of A/D conversion result

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 (Set the DUS bit in the

AD0CON3 register to 1)

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