MC68HC912BD32CFU10 FREESCALE [Freescale Semiconductor, Inc], MC68HC912BD32CFU10 Datasheet - Page 227

• Manufacturer Part Number: MC68HC912BD32CFU10
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

ATDCTL4 — ATD Control Register 4
5-adc
RESET:
SMP1
0
0
1
1
SMP0
S10BM
0
1
0
1
Bit 7
0
16 ATD clock periods
Final Sample Time
2 ATD clock periods
4 ATD clock periods
8 ATD clock periods
SMP1
6
0
S10BM — ATD 10-bit Mode Control
SMP1, SMP0 — Select Sample Time
PRS4, PRS3, PRS2, PRS1, PRS0 — Select Divide-By Factor for ATD
P-Clock Prescaler.
The ATD control register 4 is used to select the clock source and set
up the prescaler. Writes to the ATD control registers initiate a new
conversion sequence. If a write occurs while a conversion is in
progress, the conversion is aborted and ATD activity halts until a write
to ATDCTL5 occurs.
These bits are used to select one of four sample times after the
buffered sample and transfer has occurred.
The binary value written to these bits (1 to 31) selects the divide-by
factor for the modulo counter-based prescaler. The P clock is divided
by this value plus one and then fed into a 2 circuit to generate the
Freescale Semiconductor, Inc.
Table 52 Final Sample Time Selection
FRZ1
For More Information On This Product,
0 = 8 bit operation
1 = 10 bit operation
0
0
1
1
Table 51 ATD Response to Background Debug Enable
SMP0
5
0
FRZ0
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Analog to Digital Converter
0
1
0
1
Total 8-Bit Conversion Time
PRS4
4
0
18 ATD clock periods
20 ATD clock periods
24 ATD clock periods
32 ATD clock periods
Continue conversions in active background mode
PRS3
Finish current conversion, then freeze
3
0
Freeze when BDM is active
PRS2
ATD Response
2
0
Reserved
Total 10-Bit Conversion Time
PRS1
1
0
20 ATD clock periods
22 ATD clock periods
26 ATD clock periods
34 ATD clock periods
MC68HC912BD32 Rev 1.0
Analog to Digital Converter
PRS0
Bit 0
1
ATD Registers
$0064