mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 141

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
C[D:A}
Field
3:0
SRES8
Analog Input Channel Select Code — These bits select the analog input channel(s) whose signals are
sampled and converted to digital codes.
channels.
In the case of single channel conversions (MULT = 0), this selection code specified the channel to be examined.
In the case of multiple channel conversions (MULT = 1), this selection code represents the first channel to be
examined in the conversion sequence. Subsequent channels are determined by incrementing the channel
selection code or wrapping around to AN0 (after converting the channel defined by the Wrap Around Channel
Select Bits WRAP[3:0] in ATDCTL0). In case starting with a channel number higher than the one defined by
WRAP[3:0] the first wrap around will be AN15 to AN0.
1
1
1
0
0
0
V
RH
V
Input Signal
5.120 Volts
RL
Table 4-16. Left Justified, Signed and Unsigned ATD Output Codes.
= 5.12 Volts
5.100
5.080
2.580
2.560
2.540
0.020
0.000
= 0 Volts
Table 4-14. ATDCTL5 Field Descriptions (continued)
DJM
0
0
1
0
0
1
Table 4-15. Available Result Data Formats.
MC9S12XDP512 Data Sheet, Rev. 2.17
8-Bit Codes
Signed
DSGN
7F
7F
7E
FF
01
00
81
80
X
X
0
1
0
1
Chapter 4 Analog-to-Digital Converter (ATD10B16CV4) Block Description
Table 4-17
Description
8-Bit Codes
Unsigned
lists the coding used to select the various analog input
10-bit / left justified / unsigned — bits 15:6
10-bit / right justified / unsigned — bits 9:0
8-bit / right justified / unsigned — bits 7:0
8-bit / left justified / unsigned — bits 15:8
10-bit / left justified / signed -— bits 15:6
FE
FF
FF
7F
81
80
01
00
8-bit / left justified / signed — bits 15:8
Description and Bus Bit Mapping
Result Data Formats
10-Bit Codes
Signed
7FC0
7F00
7E00
FF00
0100
0000
8100
8000
10-Bit Codes
Unsigned
FFC0
FE00
FF00
7F00
8100
8000
0100
0000
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