MC68HC908GT16 Datasheet, PDF (42/412 Pages) Motorola, Inc – Microcontrollers

General Description
1.6.5 ADC and ICG Power Supply Pins (V_DDA and V_SSA)
V_DDA and V_SSA are the power supply pins for the analog-to-digital
converter (ADC) and the internal clock generator (ICG). Connect the
V_DDA pin to the same voltage potential as V_DD, and the V_SSA pin to the
same voltage potential as V_SS. Decoupling of these pins should be as
per the digital supply. See Section 5. Analog-to-Digital Converter
(ADC) and Section 7. Internal Clock Generator (ICG) Module.
1.6.6 ADC Reference Pins (V_REFH and V_REFL)
V_REFH and V_REFL are the reference voltage pins for the analog-to-digital
converter (ADC). V_REFH is the high reference supply for the ADC and
should be filtered. V_REFH can be connected to the same voltage potential
as the analog supply pin, V_DDA, or to an external precision voltage
reference. V_REFL is the low reference supply for the ADC and should be
externally filtered. While V_REFL can be connected to an external
reference, it is practical to connect it to the same voltage potential as
the analog supply pin V_SSA. See Section 5. Analog-to-Digital
Converter (ADC).
1.6.7 Port A Input/Output (I/O) Pins (PTA7/KBD7–PTA0/KBD0)
PTA7–PTA0 are general-purpose, bidirectional I/O port pins. Any or all
of the port A pins can be programmed to serve as keyboard interrupt
pins. See Section 16. Input/Output (I/O) Ports and Section 13.
Keyboard Interrupt Module (KBI).
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.
1.6.8 Port B I/O Pins (PTB7/AD7–PTB0/AD0)
PTB7–PTB0 are general-purpose, bidirectional I/O port pins that can
also be used for analog-to-digital converter (ADC) inputs. See
Section 16. Input/Output (I/O) Ports and Section 5. Analog-to-Digital
Converter (ADC).
Technical Data
42
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
General Description
MOTOROLA