mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 24

• Manufacturer Part Number: mc68hc908gr8a
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.5.5 CGM Power Supply Pins (V
V
Decoupling of these pins should be as per the digital supply. See
(CGM).
1.5.6 External Filter Capacitor Pin (V
CGMXFC is an external filter capacitor connection for the CGM. See
(CGM).
1.5.7 ADC Power Supply/Reference Pins (V
V
are the reference voltage pins for the ADC. V
the V
V
to the same voltage potential as V
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
Keyboard Interrupt Module
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.
1.5.9 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
1.5.10 Port C I/O Pins (PTC1 and PTC0)
PTC1 and PTC0 are general-purpose, bidirectional I/O port pins. PTC1–PTC0 are only available on the
32-pin LQFP package. See
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
Chapter 15 Serial Peripheral Interface (SPI)
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.
24
DDA
DDAD
REFL
DDAD
and V
is the low reference supply for the ADC, and by default the V
and V
/V
(ADC).
SSA
REFH
SSAD
are the power supply pins for the analog portion of the clock generator module (CGM).
pin should be externally filtered and connected to the same voltage potential as V
are the power supply pins to the analog-to-digital converter (ADC). V
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
(KBI).
Chapter 12 Input/Output (I/O)
Chapter 12 Input/Output (I/O) Ports
SS
. See
DDA
Chapter 3 Analog-to-Digital Converter
CGMXFC
and V
REFH
Module, and
Chapter 17 Timer Interface Module (TIM1 and
is the high reference supply for the ADC, and by default
SSA
DDAD
)
Chapter 12 Input/Output (I/O) Ports
)
/V
Chapter 12 Input/Output (I/O)
Ports.
REFH
and V
and
Chapter 4 Clock Generator Module
SSAD
Chapter 4 Clock Generator Module
Chapter 3 Analog-to-Digital
SSAD
/V
REFL
/V
pin should be connected
REFL
(ADC).
Freescale Semiconductor
)
REFH
Ports.
and
TIM2),
and V
Chapter 9
REFL
DD
.