MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 243
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MC9S12E32CFU
Manufacturer Part Number
MC9S12E32CFU
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12E32CFU.pdf
(606 pages)
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7.4
The DAC8B1C module consists of analog and digital sub-blocks.
7.4.1
Data to be converted is written to DACD register. The data can be mapped either to left end or right end of
DACD register by clearing or setting DJM bit of DACC0 register. Also, the data written to DACD can be
a signed or unsigned data depending on DSGN bit of DACC0 register. See
formats. The maximum unsigned data that can be written to DACD register is $FF while the minimum
value is $00. If the data is signed, the maximum value that can be written to DACD is $7F while the
minimum value is $80, where $7F (signed) corresponds to $FF (unsigned) and $80 (signed) corresponds
to $00 (unsigned).
corresponding voltage output. See
Freescale Semiconductor
Functional Description
Functional Description
DJM
Table 7-4
0
0
1
1
shows this characteristic between signed, unsigned data values and their
V
DSGN
REF
0
1
0
1
Table 7-4. Signed and Unsigned Data
Table 7-4
Input signal
/V
MC9S12E128 Data Sheet, Rev. 1.07
V
RH
2.580
0.020
0.000
RL
5.12
5.08
5.07
2.56
2.54
2.52
= 5.12volts
Table 7-3. Data Formats
and DAC Output Codes
= 0
for DAC signed and un-signed data and DAC output codes.
8 bit/right justified/unsigned — bits 7–0
8 bit/left justified/unsigned — bits 15–8
8 bit/left justified/signed — bits 15–8
8 bit/right justified/signed bits — 7–0
Description and Bus Bit Mapping
Signed
Codes
8-Bit
7E
7D
FF
FE
7F
01
00
81
80
Chapter 7 Digital-to-Analog Converter (DAC8B1CV1)
Unsigned
Codes
8-Bit
FE
FD
FF
7F
7E
81
80
01
00
Table 7-3
below for data
243
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