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MC908GR8CDWE Datasheet, PDF (33/408 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers
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Freescale Semiconductor, Inc.
General Description
Pin Functions
1.6.6 External Filter Capacitor Pin (CGMXFC)
CGMXFC is an external filter capacitor connection for the CGM. See
Clock Generator Module (CGMC).
1.6.7 Analog Power Supply/Reference Pins (VDDAD/VREFH and VSSAD/VREFL)
VDDAD and VSSAD are the power supply pins for the analog-to-digital
converter. Decoupling of these pins should be as per the digital supply.
NOTE:
VREFH is the high reference supply for the ADC. The VREFH signal is
internally connected with VDDAD and have the same potential as VDDAD.
VDDAD should be tied to the same potential as VDD via separate traces.
VREFL is the low reference supply for the ADC. The VREFL pin is
internally connected with VSSAD and has the same potential as VSSAD.
VSSAD should be tied to the same potential as VSS via separate traces.
See Analog-to-Digital Converter (ADC).
1.6.8 Port A Input/Output (I/O) Pins (PTA3/KBD3–PTA0/KBD0)
PTA3–PTA0 are special-function, bidirectional I/O port pins. Any or all of
the port A pins can be programmed to serve as keyboard interrupt pins.
See Input/Output Ports (I/O) and External Interrupt (IRQ).
These port pins also have selectable pullups when configured for input
mode. The pullups are disengaged when configured for output mode.
The pullups are selectable on an individual port bit basis.
When the port pins are configured for special-function mode (KBI),
pullups will be automatically engaged. As long as the port pins are in
special-function mode, the pullups will always be on.
1.6.9 Port B I/O Pins (PTB5/AD5–PTB0/AD0)
PTB5–PTB0 are special-function, bidirectional I/O port pins that can also
be used for analog-to-digital converter (ADC) inputs. See Input/Output
Ports (I/O) and Analog-to-Digital Converter (ADC).
There are no pullups associated with this port.
MC68HC908GR8 — Rev 4.0
MOTOROLA
General Description
For More Information On This Product,
Go to: www.freescale.com
Technical Data
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