MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 382

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

ATD0CTL4/ATD1CTL4 — ATD Control Register 4
Analog-to-Digital Converter
19.9.3 ATDCTL4 ATD Control Register 4
Technical Data
382
RESET:
RES10
Bit 7
0
SMP1
6
0
FRZ1, FRZ0 — Background Debug Freeze Enable
ATD control register 4 is used to select the internal ATD clock frequency
(based on the system clock), select the length of the third phase of the
sample period, and set the resolution of the A/D conversion (i.e. 8-bits or
10-bits). All writes to this register have an immediate effect. If a
conversion is in progress, the entire conversion sequence is aborted. A
write to this register (or ATDCTL5) initiates a new conversion sequence.
Finally, which result registers hold valid data can be tracked using the
conversion complete flags. Fast flag clear mode may or may not be
useful in a particular application to track valid data.
Background debug freeze function allows the ATD module to pause
when a breakpoint is encountered.
FRZ0 determine the ATD’s response to a breakpoint. When BDM is
deasserted, the ATD module continues operating as it was before the
breakpoint occurred.
Table 19-3. ATD Response to Background Debug Enable
SMP0
FRZ1
5
0
0
0
1
1
Analog-to-Digital Converter
FRZ0
PRS4
0
1
0
1
4
0
Continue conversions in active background mode
PRS3
3
0
Finish current conversion, then freeze
Freeze when BDM is active
PRS2
Table 19-3
2
0
ATD Response
Reserved
MC68HC912DT128A — Rev 4.0
PRS1
1
0
shows how FRZ1 and
PRS0
Bit 0
1
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