mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 172

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (S08ADC12V1)
9.2.1
The ADC analog portion uses V
internally to V
External filtering may be necessary to ensure clean V
9.2.2
The ADC analog portion uses V
internally to V
9.2.3
V
V
by an external source between the minimum V
exceed V
9.2.4
V
V
9.2.5
The ADC module supports up to 28 separate analog inputs. An input is selected for conversion through
the ADCH channel select bits.
9.3
These memory-mapped registers control and monitor operation of the ADC:
9.3.1
This section describes the function of the ADC status and control register (ADCSC1). Writing ADCSC1
aborts the current conversion and initiates a new conversion (if the ADCH bits are equal to a value other
than all 1s).
9-6
REFH
DDA
REFL
SSA
•
•
•
•
•
•
. If externally available, connect the V
. If externally available, V
is the low-reference voltage for the converter. In some packages, V
is the high reference voltage for the converter. In some packages, V
Status and control register, ADCSC1
Status and control register, ADCSC2
Data result registers, ADCRH and ADCRL
Compare value registers, ADCCVH and ADCCVL
Configuration register, ADCCFG
Pin control registers, APCTL1, APCTL2, APCTL3
DDA
Register Definition
Analog Power (V
Analog Ground (V
Voltage Reference High (V
Voltage Reference Low (V
Analog Channel Inputs (ADx)
Status and Control Register 1 (ADCSC1)
).
DD
SS
. If externally available, connect the V
. If externally available, connect the V
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
DDA
SSA
REFH
DDA
as its ground connection. In some packages, V
SSA
as its power connection. In some packages, V
may be connected to the same potential as V
)
)
REFL
DDA
REFL
REFH
pin to the same voltage potential as V
spec and the V
DDA
)
)
SSA
DDA
for good results.
pin to the same voltage potential as V
pin to the same voltage potential as V
DDA
potential (V
REFH
REFL
is connected internally to
is connected internally to
DDA
DDA
SSA
REFH
Freescale Semiconductor
SSA
is connected
or may be driven
is connected
must never
.
SS
DD
.
.