mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 50

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (ADC)
3.4 Interrupts
When the AIEN bit is set, the ADC module is capable of generating a CPU interrupt after each ADC
conversion. A CPU interrupt is generated if the COCO bit is at 0. The COCO bit is not used as a
conversion complete flag when interrupts are enabled.
3.5 Wait Mode
The WAIT instruction can put the MCU in low power-consumption 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.
3.6 I/O Signals
The ADC module has 10 input signals that are shared with port B and port C.
3.6.1 ADC Analog Power Pin (V
The ADC analog portion uses V
potential as V
3.6.2 ADC Analog Ground Pin (V
The ADC analog portion uses V
potential as V
3.6.3 ADC Voltage Reference Pin (V
V
voltage potential as
Specifications.
3.6.4 ADC Voltage Reference Low Pin (V
V
V
50
REFH
REFL
SSAD
. A finite current will be associated with V
is the lower reference supply for the ADC. Connect the V
is the power supply for setting the reference voltage V
DD
SS
Route V
capacitors as close as possible to the package.
Route V
capacitors as close as possible to the package.
In the 56-pin shrink dual in-line package (SDIP), V
together.
.
. External filtering may be necessary to ensure clean V
V
DDAD
DDAD
REFH
. There will be a finite current associated with V
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
carefully for maximum noise immunity and place bypass
carefully for maximum noise immunity and place bypass
DDAD
SSAD
DDAD
as its ground pin. Connect the V
as its power pin. Connect the V
SSAD
REFH
)
)
REFL
)
REFL
NOTE
NOTE
NOTE
. See
)
Chapter 19 Electrical
REFH
REFL
REFL
. Connect the V
pin to the same voltage potential as
DDAD
SSAD
and V
DDAD
REFH
pin to the same voltage
pin to the same voltage
SSAD
for good results.
. See
Specifications.
are tied
REFH
Chapter 19 Electrical
Freescale Semiconductor
pin to the same