MC68HC908GZ16 Datasheet, PDF (27/314 Pages) Motorola, Inc – Microcontrollers

Pin Functions
1.5.5 CGM Power Supply Pins (V_DDA and V_SSA)
V_DDA and V_SSA are the power supply pins for the analog portion of the clock generator module (CGM).
Decoupling of these pins should be as per the digital supply. See Chapter 4 Clock Generator Module
(CGM).
1.5.6 External Filter Capacitor Pin (V_CGMXFC)
CGMXFC is an external filter capacitor connection for the CGM. See Chapter 4 Clock Generator Module
(CGM).
1.5.7 ADC Power Supply/Reference Pins (V_DDAD/V_REFH and V_SSAD/V_REFL)
V_DDAD and V_SSAD are the power supply pins to the analog-to-digital converter (ADC). V_REFH and V_REFL
are the reference voltage pins for the ADC. V_REFH is the high reference supply for the ADC, and by default
the V_DDAD/V_REFH pin should be externally filtered and connected to the same voltage potential as V_DD.
V_REFL is the low reference supply for the ADC, and by default the V_SSAD/V_REFL pin should be connected
to the same voltage potential as V_SS. See Chapter 3 Analog-to-Digital Converter (ADC).
1.5.8 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. PTA7–PTA4 are only available on the 48-pin LQFP
package. See Chapter 13 Input/Output (I/O) Ports and Chapter 9 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.
1.5.9 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. PTB7–PTB4 are only available on the 48-pin LQFP package. See Chapter 13
Input/Output (I/O) Ports and Chapter 3 Analog-to-Digital Converter (ADC).
1.5.10 Port C I/O Pins (PTC6–PTC0/CAN_TX)
PTC6 and PTC5 are general-purpose, bidirectional I/O port pins. PTC4–PTC0 are general-purpose,
bidirectional I/O port pins that contain higher current sink/source capability. PTC6–PTC2 are only
available on the 48-pin LQFP package. See Chapter 13 Input/Output (I/O) Ports and Chapter 12
MSCAN08 Controller (MSCAN08).
PTC1 and PTC0 can be programmed to be MSCAN08 pins.
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 (PTD7/T2CH1–PTD0/SS)
PTD7–PTD0 are special-function, bidirectional I/O port pins. PTD3–PTD0 can be programmed to be
serial peripheral interface (SPI) pins, while PTD7–PTD4 can be individually programmed to be timer
interface module (TIM1 and TIM2) pins. PTD7 is only available on the 48-pin LQFP package. See Chapter
19 Timer Interface Module (TIM), Chapter 17 Serial Peripheral Interface (SPI) Module, and Chapter 13
Input/Output (I/O) Ports.
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 1
Freescale Semiconductor
27