Section 39 D/A Converter (DAC)
Rev. 1.00 Oct. 01, 2007 Page 1677 of 1956
REJ09B0256-0100
39.4 Operation
The D/A converter incorporates two D/A channels that can operate individually.
The D/A converter executes D/A conversion while analog output is enabled by the D/A control
register (DACR). If the D/A data registers (DADR0 and DADR1) are modified, the D/A
converter immediately initiates the new data conversion. When the DAOE1 and DAOE0 bits in
the DACR register are set to 1, D/A conversion results are output.
An example of D/A conversion for channel 0 is shown below. The operation timing is shown in
figure 39.2.
1. Write conversion data to DADR0.
2. When the DAOE0 bit in DACR is set to 1, D/A conversion starts. The results are output after
the conversion has ended. The output value will be (DADR0 contents/256)
×
AVcc.
The conversion results are output continuously until DADR0 is modified or the DAOE0 bit is
cleared to 0.
3. When D/A data register 0 (DMDR0) is modified, the conversion starts again.
The results are output after the conversion has ended.
4. When the DAOE0 bit is cleared to 0, analog output is disabled (high-impedance state).
DADR0
Address bus
Pck0
DADR0
write cycle
DADR0
write cycle
DACR
write cycle
DACR
write cycle
DAOE0
DA0
[Legend]
t
DCONV
: D/A conversion time
High impedance
state
Conversion result (1)
Conversion
result (2)
Conversion data (1)
Conversion data (2)
t
DCONV
t
DCONV
Figure 39.2 D/A Converter Operation Example
Содержание SH7763
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Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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