M30620FCAFP datasheet(459/615 Pages) RENESAS

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D-A Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-142

2.8 D-A Converter Usage

Figure 2.8.2. D-A converter-related registers

Figure 2.8.1. Memory map of D-A converter-related registers

03D816

03D916

03DA16

03DB16

03DC16

D-A register 0 (DA0)

D-A register 1 (DA1)

D-A control register (DACON)

D-A control register

Symbol

Address

When reset

DACON

03DC16

0016

D-A0 output enable bit

DA0E

Bit symbol

Bit name

Function

R W

0 : Output disabled

1 : Output enabled

D-A1 output enable bit

0 : Output disabled

1 : Output enabled

DA1E

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”

D-A register

Symbol

Address

When reset

DAi (i = 0,1)

03D816, 03DA16

Indeterminate

Function

R W

Output value of D-A conversion

2.8.1 Overview of the D-A converter usage

The D-A converter used in the M16C/62A group is based on the 8-bit R-2R technique.

(1) Output voltage

The D-A converter outputs voltage within a range from 0 V to VREF. The output voltage is determined

by VREF/(256) X the D-A register contents.

The D-A converter is not effected by the Vref connection bit of the A-D converter.

(2) Conversion time

tsu = 3

µs

(3) Output from the D-A converter and the direction register

To use the D-A converter, do not set the direction register of the relevant port to output.

(4) Pins related to the D-A converter

• DA0 pin, DA1 pin

Output pins of the D-A converter

• AVcc pin

The power source pin of the analog section

• VREF pin

Input pin of the reference voltage

• AVss pin

The GND pin of the analog section

(5) Registers related to the D-A converter

Figure 2.8.1 shows the memory map of D-A converter-related registers, and Figure 2.8.2 shows D-A

converter-related registers.

(6) Note

D-A output pins shared with P93 and P94. The two pins are input ports and floating at the reset.

M30620FCAFP Datasheet(PDF) 459 Page - Renesas Technology Corp

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