Freescale Semiconductor MC68HC908MR32 - Manual (Page 23)

Pin Assignments
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor 23
1.4.6 External Filter Capacitor Pin (CGMXFC)
CGMXFC is an external filter capacitor connection for the CGM. See Chapter 4 Clock Generator Module
(CGM) .
1.4.7 Analog Power Supply Pins (V
DDAD
and V
SSAD
)
V
DDAD
and V
SSAD
are the power supply pins for the analog-to-digital converter. Decoupling of these pins
should be per the digital supply. See Chapter 3 Analog-to-Digital Converter (ADC) .
1.4.8 ADC Voltage Decoupling Capacitor Pin (V
REFH
)
V
REFH
is the power supply for setting the reference voltage. Connect the V
REFH
pin to the same voltage
potential as V
DDAD
. See Chapter 3 Analog-to-Digital Converter (ADC) .
1.4.9 ADC Voltage Reference Low Pin (V
REFL
)
V
REFL
is the lower reference supply for the ADC. Connect the V
REFL
pin to the same voltage potential as
V
SSAD
. See Chapter 3 Analog-to-Digital Converter (ADC) .
1.4.10 Port A Input/Output (I/O) Pins (PTA7–PTA0)
PTA7–PTA0 are general-purpose bidirectional input/output (I/O) port pins. See Chapter 10 Input/Output
(I/O) Ports (PORTS) .
1.4.11 Port B I/O Pins (PTB7/ATD7–PTB0/ATD0)
Port B is an 8-bit special function port that shares all eight pins with the analog-to-digital converter (ADC).
See
Chapter 3 Analog-to-Digital Converter (ADC) and Chapter 10 Input/Output (I/O) Ports (PORTS) .
1.4.12 Port C I/O Pins (PTC6–PTC2 and PTC1/ATD9–PTC0/ATD8)
PTC6–PTC2 are general-purpose bidirectional I/O port pins Chapter 10 Input/Output (I/O) Ports
(PORTS) . PTC1/ATD9–PTC0/ATD8 are special function port pins that are shared with the
analog-to-digital converter (ADC). See Chapter 3 Analog-to-Digital Converter (ADC) and Chapter 10
Input/Output (I/O) Ports (PORTS) .
1.4.13 Port D Input-Only Pins (PTD6/IS3–PTD4/IS1 and PTD3/FAULT4–PTD0/FAULT1)
PTD6/IS3–PTD4/IS1 are special function input-only port pins that also serve as current sensing pins for
the pulse-width modulator module (PWMMC). PTD3/FAULT4–PTD0/FAULT1 are special function port
pins that also serve as fault pins for the PWMMC. See
Chapter 12 Pulse-Width Modulator for Motor
Control (PWMMC) and Chapter 10 Input/Output (I/O) Ports (PORTS) .
1.4.14 PWM Pins (PWM6–PWM1)
PWM6–PWM1 are dedicated pins used for the outputs of the pulse-width modulator module (PWMMC).
These are high-current sink pins. See
Chapter 12 Pulse-Width Modulator for Motor Control (PWMMC)
and Chapter 19 Electrical Specifications .