MC908MR16CFUE Datasheet, PDF (23/282 Pages) Freescale Semiconductor, Inc – On-chip programming firmware for use with host personal computer, Clock generator module (CGM)

Pin Assignments
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.
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor
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