Motorola MC68HC908MR32 사용자 설명서
Analog-to-Digital Converter (ADC)
Wait Mode
MC68HC908MR16/MC68HC908MR32 — Rev. 4.0
Advance Information
MOTOROLA
Analog-to-Digital Converter (ADC)
347
19.6 Wait Mode
The WAIT instruction can put the MCU in low power-consumption
standby mode.
standby mode.
The ADC continues normal operation during wait mode. Any enabled
CPU interrupt request from the ADC can bring the MCU out of wait
mode. If the ADC is not required to bring the MCU out of wait mode,
power down the ADC by setting ADCH[4:0] in the ADC status and control
register before executing the WAIT instruction.
CPU interrupt request from the ADC can bring the MCU out of wait
mode. If the ADC is not required to bring the MCU out of wait mode,
power down the ADC by setting ADCH[4:0] in the ADC status and control
register before executing the WAIT instruction.
19.7 I/O Signals
The ADC module has 10 input signals that are shared with port B and
port C.
port C.
19.7.1 ADC Analog Power Pin (V
DDAD
)
The ADC analog portion uses V
DDAD
as its power pin. Connect the
V
DDAD
pin to the same voltage potential asV
DD
. External filtering may be
necessary to ensure clean V
DDAD
for good results.
NOTE:
Route V
DDAD
carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
19.7.2 ADC Analog Ground Pin (V
SSAD
)
The ADC analog portion uses V
SSAD
as its ground pin. Connect the
V
SSAD
pin to the same voltage potential as V
SS
.
19.7.3 ADC Voltage Reference Pin (V
REFH
)
V
REFH
is the power supply for setting the reference voltage V
REFH
.
Connect the V
REFH
pin to the same voltage potential as V
DDAD
. There
will be a finite current associated with V
REFH
. See
.
NOTE:
Route V
REFH
carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.