mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 241

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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
MC9S12E256 Data Sheet, Rev. 1.08
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/left justified/unsigned — bits 15–8
8 bit/right justified/unsigned — bits 7–0
8 bit/right justified/signed bits — 7–0
8 bit/left justified/signed — bits 15–8
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
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