M32CSLASH8B datasheet(288/406 Pages) RENESAS

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M32C/8B Group

19. D/A Converter

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 271 of 385

19. D/A Converter

The D/A converter consists of two independent 8-bit R-2R ladder D/A converter circuits.

Digital code is converted to analog voltage every time a value to be converted is written to the corresponding DAi

The DAiE bit in the DACON register determines whether the D/A conversion result is output or not. When the DAiE

bit is set to 1 (output enabled), pull-up for the corresponding port is disabled.

When the D/A converter is not used, set the DAi register to 00h and the DAiE bit to 0 (output disabled).

Output analog voltage (

V) is obtained from the following equation using the value n (n = decimal) set in the DAi

VREF: Reference voltage (VREF remains connected even if the VCUT bit in the AD0CON1 register is set to 0)

Table 19.1 lists specifications of the D/A converter. Figure 19.1 shows a block diagram of the D/A converter. Table

19.2 lists pin settings of DA0 and DA1. Figure 19.2 shows registers associated with the D/A converter. Figure 19.3

shows a D/A converter equivalent circuit.

Table 19.1

D/A Converter Specifications

Figure 19.1

D/A Converter Block Diagram

Item

Specification

D/A conversion method

R-2R

Resolution

8 bits

Analog output pin

2 channels

V =

256

VREF x n

(n = 0 to 255)

DA0E, DA1E: Bits in the DACON register

Low-order bits of data bus

R-2R Resistor Ladder

DA1 Register

R-2R Resistor Ladder

DA0E

DA1E

DA1

DA0

DA0 Register

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