MC68HC908MR16CFU Freescale Semiconductor, MC68HC908MR16CFU Datasheet - Page 51
MC68HC908MR16CFU
Manufacturer Part Number
MC68HC908MR16CFU
Description
IC MCU 8MHZ 16K FLASH 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908MR16CFUE.pdf
(282 pages)
Specifications of MC68HC908MR16CFU
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
44
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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3.6.5 ADC Voltage In (ADVIN)
ADVIN is the input voltage signal from one of the 10 ADC channels to the ADC module.
3.6.6 ADC External Connections
This section describes the ADC external connections: V
3.6.6.1 V
Both ac and dc current are drawn through the V
current spikes required to supply charge to the capacitor array at each successive approximation step.
The current flows through the internal resistor string. The best external component to meet both these
current demands is a capacitor in the 0.01 µF to 1 µF range with good high frequency characteristics. This
capacitor is connected between V
package pins. Resistance in the path is not recommended because the dc current will cause a voltage
drop which could result in conversion errors.
3.6.6.2 ANx
Empirical data shows that capacitors from the analog inputs to V
and 0.1-µF capacitors with good high-frequency characteristics are sufficient. These capacitors must be
placed as close as possible to the package pins.
3.6.6.3 Grounding
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
pin to the same potential as V
3.7 I/O Registers
These I/O registers control and monitor operation of the ADC:
Freescale Semiconductor
•
•
•
ADC status and control register, ADSCR
ADC data registers, ADRH and ARDL
ADC clock register, ADCLK
REFH
and V
REFL
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
SSAD
SSA
REFH
at the single point ground location.
pin makes a good single point ground location. Connect the V
and V
SSAD
REFL
REFH
pin. This should be the only ground connection between
and must be placed as close as possible to the
and V
REFH
REFL
and V
REFL
loop. The AC current is in the form of
REFL
improve ADC performance. 0.01-µF
, ANx, and grounding.
I/O Registers
REFL
51
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