mc68hc908gr8vp Freescale Semiconductor, Inc, mc68hc908gr8vp Datasheet - Page 25

• Manufacturer Part Number: mc68hc908gr8vp
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1.5.6 External Filter Capacitor Pin (CGMXFC)
CGMXFC is an external filter capacitor connection for the CGM. See
(CGMC).
1.5.7 Analog Power Supply/Reference Pins (V
V
should be as per the digital supply.
See
1.5.8 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
Chapter 12 External Interrupt
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.
1.5.9 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
Converter
There are no pullups associated with this port.
1.5.10 Port C I/O Pins (PTC1–PTC0)
PTC1–PTC0 are general-purpose, bidirectional I/O port pins. See
PTC0 and PTC1 are only available on 32-pin QFP packages.
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.
1.5.11 Port D I/O Pins (PTD6/T2CH0–PTD0/SS)
PTD6–PTD0 are special-function, bidirectional I/O port pins. PTD3–PTD0 can be programmed to be
serial peripheral interface (SPI) pins, while PTD6–PTD4 can be individually programmed to be timer
interface module (TIM1 and TIM2) pins. See
Peripheral Interface
Freescale Semiconductor
DDAD
Chapter 5 Analog-to-Digital Converter
and V
(ADC).
SSAD
V
internally connected with V
V
V
connected with V
be tied to the same potential as V
REFH
DDAD
REFL
are the power supply pins for the analog-to-digital converter. Decoupling of these pins
(SPI), and See
is the low reference supply for the ADC. The V
is the high reference supply for the ADC. The V
should be tied to the same potential as V
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Chapter 16 Input/Output Ports (I/O)
(IRQ).
SSAD
Chapter 16 Input/Output Ports
and has the same potential as V
DDAD
(ADC).
Chapter 22 Timer Interface Module
and have the same potential as V
SS
NOTE
via separate traces.
DDAD
Chapter 16 Input/Output Ports (I/O)
/V
REFH
DD
and See
via separate traces.
Chapter 16 Input/Output Ports
(I/O).
and V
REFL
Chapter 7 Clock Generator Module
SSAD.
REFH
pin is internally
Chapter 5 Analog-to-Digital
SSAD
signal is
V
SSAD
(TIM),
/V
DDAD.
should
REFL
Chapter 20 Serial
)
and See
Pin Functions
(I/O).
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