MC908JL16CFAE FREESCALE [Freescale Semiconductor, Inc], MC908JL16CFAE Datasheet - Page 130

• Manufacturer Part Number: MC908JL16CFAE
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Analog-to-Digital Converter (ADC)
If ACLKEN is set, a conversion can be initiated while in stop using the external hardware trigger
ADEXTCO when in external convert mode. The ADC10 will operate in a low-power mode until the trigger
is asserted, at which point it will perform a conversion and assert the interrupt when complete (if AIEN is
set).
9.6 ADC10 During Break Interrupts
The system integration module (SIM) controls whether status bits in other modules can be cleared during
the break state. BCFE in the break flag control register (BFCR) enables software to clear status bits during
the break state. See BFCR in the SIM section of this data sheet.
To allow software to clear status bits during a break interrupt, write a 1 to BCFE. If a status bit is cleared
during the break state, it remains cleared when the MCU exits the break state.
To protect status bits during the break state, write a 0 to BCFE. With BCFE cleared (its default state),
software can read and write registers during the break state without affecting status bits. Some status bits
have a two-step read/write clearing procedure. If software does the first step on such a bit before the
break, the bit cannot change during the break state as long as BCFE is cleared. After the break, doing the
second step clears the status bit.
9.7 Input/Output Signals
The ADC10 module shares its pins with general-purpose input/output (I/O) port pins. The ADC10 on this
MCU uses V
source.
9.7.1 ADC10 Analog Power Pin (V
The ADC10 analog portion uses V
to V
may be necessary to ensure clean V
9.7.2 ADC10 Analog Ground Pin (V
The ADC10 analog portion uses V
to V
In cases where separate power supplies are used for analog and digital power, the ground connection
between these supplies should be at the V
these supplies if possible. The V
9.7.3 ADC10 Voltage Reference High Pin (V
V
V
potential as V
the V
130
REFH
REFH
DD
SS
DDA
. If externally available, connect the V
. If externally available, connect the V
is the power supply for setting the high-reference voltage for the converter. In some packages,
is connected internally to V
potential (V
DD
DDA
If externally available, route V
and place bypass capacitors as near as possible to the package.
and V
, or may be driven by an external source that is between the minimum V
REFH
SS
as its supply and reference pins. This MCU does not have an external trigger
must never exceed V
SSA
SSA
DDA
DDA
MC68HC908JL16 Data Sheet, Rev. 1.1
DDA
pin makes a good single point ground location.
. If externally available, V
as its ground pin. In some packages, V
as its power pin. In some packages, V
DDA
for good results.
SSA
SSA
DDA
SSA
)
DDA
)
pin. This should be the only ground connection between
pin to the same voltage potential as V
DDA
pin to the same voltage potential as V
NOTE
carefully for maximum noise immunity
REFH
).
)
REFH
may be connected to the same
DDA
SSA
is connected internally
is connected internally
Freescale Semiconductor
DD
SS
. External filtering
.
DDA
spec and