MC68HC912BD32 Datasheet, PDF (224/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Analog to Digital Converter
RC DAC ARRAY
AND COMPARATOR
SAR
ATD 0
ATD 1
ATD 2
ATD 3
ATD 4
ATD 5
ATD 6
ATD 7
V_RH
V_RL ^REFERENCE
V_DDA
V_SSA
SUPPLY
ANALOG MUX
AND
SAMPLE BUFFER AMP
PORT AD
DATA INPUT REGISTER
AN7/PAD7
AN6/PAD6
AN5/PAD5
AN4/PAD4
AN3/PAD3
AN2/PAD2
AN1/PAD1
AN0/PAD0
CLOCK
SELECT/PRESCALE
INTERNAL BUS
Figure 55 Analog-to-Digital Converter Block Diagram
Functional Description
A single conversion sequence consists of four or eight conversions,
depending on the state of the select 8 channel mode (S8CM) bit when
ATDCTL5 is written. There are eight basic conversion modes. In the
non-scan modes, the SCF bit is set after the sequence of four or eight
conversions has been performed and the ATD module halts. In the scan
modes, the SCF bit is set after the first sequence of four or eight
conversions has been performed, and the ATD module continues to
restart the sequence. In both modes, the CCF bit associated with each
register is set when that register is loaded with the appropriate
conversion result. That flag is cleared automatically when that result
register is read. The conversions are started by writing to the control
registers.
MC68HC912BD32 Rev 1.0
Analog to Digital Converter
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