MC68HC912BD32 Datasheet, PDF (229/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Analog to Digital Converter
ATD Registers
0 = Conversion sequence consists of four conversions
1 = Conversion sequence consists of eight conversions
SCAN — Enable Continuous Channel Scan
0 = Single conversion sequence
1 = Continuous conversion sequences (scan mode)
When a conversion sequence is initiated by a write to the ATDCTL
register, the user has a choice of performing a sequence of four (or
eight, depending on the S8CM bit) conversions or continuously
performing four (or eight) conversion sequences.
MULT — Enable Multichannel Conversion
0 = ATD sequencer runs all four or eight conversions on a single
input channel selected via the CD, CC, CB, and CA bits.
1 = ATD sequencer runs each of the four or eight conversions on
sequential channels in a specific group. Refer to Table 54.
CD, CC, CB, and CA — Channel Select for Conversion
Table 54 Multichannel Mode Result Register Assignment
S8CM CD
CC
CB
CA
Channel Signal
Result in ADRx
if MULT = 1
0
0
AN0
ADR0
0
1
AN1
0
0
0
1
0
AN2
ADR1
ADRx
1
1
AN3
ADR3
0
0
AN4
ADR0
0
1
AN5
0
0
1
1
0
AN6
ADR1
ADR2
1
1
AN7
ADR3
0
0
Reserved
ADR0
0
1
0
1
0
1
0
Reserved
Reserved
ADR1
ADR2
1
1
Reserved
ADR3
0
0
V_RH
0
1
0
1
1
V_RL
1
0
(V_RH + V_RL)/2
1
1
TEST/Reserved
ADR0
ADR1
ADR2
ADR3
7-adc
Analog to Digital Converter
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MC68HC912BD32 Rev 1.0