M32CSLASH86 datasheet(270/505 Pages) RENESAS

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18. A/D Converter

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18.1.5 Repeat Sweep Mode 1

In repeat sweep mode 1, analog voltage selectively applied to eight pins is repeatedly converted to a

digital code. Table 18.6 lists specifications of repeat sweep mode 1.

Table 18.6 Repeat Sweep Mode 1 Specifications

Item

Specification

Function

The SCAN1 and SCAN0 bits in the AD0CON1 register and the APS1 and APS0

bits in the AD0CON2 register select 8 pins. Analog voltage selectively applied to

8 pins is repeatedly converted to a digital code

e.g., When ANi0 is selected (i =none, 0, 2, 15), analog voltage is converted to a

digital code in the following order:

ANi0

ANi1

ANi0

ANi2

ANi0

ANi3 ....... etc.

Start Condition

Same as one-shot mode (Any trigger generated during an A/D conversion is invalid)

Stop Condition

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

Interrupt Request Generation Timing • When the DUS bit in the AD0CON3 register is set to "0" (DMAC operating

mode disabled), no interrupt request is generated

• When DUS bit is set to "1" (DMAC operating mode enabled), an interrupt request

is generated every time an A/D conversion is completed

Analog Voltage Input Pins

ANi0 to ANi7 (8 pins)

Prioritized Pins

ANi0 (1 pin), ANi0 and ANi1 (2 pins), ANi0 to ANi2 (3 pins) or ANi0 to ANi3 (4 pins)

Reading of A/D Conversion Result • When the DUS bit is set to "0", the microcomputer reads the AD0j register (j=0 to

7) corresponding to selected pins

• When the DUS bit is set to "1", 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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