M32CSLASH86 datasheet(277/505 Pages) RENESAS

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19. D/A Converter

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19. D/A Converter

The D/A converter consists of two separate 8-bit R-2R ladder D/A converters.

Digital code is converted to an analog voltage when a value is written to the corresponding DAi registers

(i=0,1). The DAiE bit in the DACON register determines whether the D/A conversion result output is pro-

vided or not. Set the DAiE bit to "1" (output enabled) to disable a pull-up of a corresponding port.

Output analog voltage (

V) is calculated from value n (n=decimal) set in the DAi register.

V =

(

n = 0 to 255)

VREF : reference voltage (not related to VCUT bit setting in the AD0CON1 register)

Table 19.1 lists specifications of the D/A converter. Table 19.2 lists the DA0 and DA1 pin settings. Figure

19.1 shows a block diagram of the D/A converter. Figure 19.2 shows the D/A control register. Figure 19.3

shows a D/A converter equivalent circuit.

When the D/A converter is not used, set the DAi register to "0016" and the DAiE bit to "0" (output disabled).

Table 19.1 D/A Converter Specifications

Item

Specification

D/A Conversion Method

R-2R

Resolution

8 bits

Analog Output Pin

2 channels

Table 19.2 Pin Settings

Port

Function

Bit and Setting

PD9 Register(1)

PS3 Register(1)

PSL3 Register

P93

DA0 output

PD9_3=0

PS3_3=0

PSL3_3=1

P94

DA1 output

PD9_4=0

PS3_4=0

PSL3_4=1

NOTES:

1. Set the PD9 and PS3 registers immediately after the PRC2 bit in the PRCR register is set to "1" (write

enable). Do not generate an interrupt or a DMA transfer between the instruction to set the PRC2 bit to "1"

and the instruction to set the PD9 and PS3 registers.

VREF x

256

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