MC68HC908GT16_07 Datasheet, PDF(27/292 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC68HC908GT16_07 Datasheet, PDF (27/292 Pages) Freescale Semiconductor, Inc – Microcontrollers

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Pin Functions

MCU

VDD

VSS

C1

0.1 Î¼F

+

C2

VDD

Note: Component values shown represent typical applications.

Figure 1-4. Power Supply Bypassing

1.5.2 Oscillator Pins (PTE4/OSC1 and PTE3/OSC2)

PTE4/OSC1 and PTE3/OSC2 are general-purpose, bidirectional I/O port pins. These pins can also be

programmed to be the connections for an external crystal, resonator or clock circuit. See Chapter 7

Internal Clock Generator (ICG) Module).

1.5.3 External Reset Pin (RST)

A logic 0 on the RST pin forces the MCU to a known startup state. RST is bidirectional, allowing a reset

of the entire system. It is driven low when any internal reset source is asserted. This pin contains an

internal pullup resistor. See Chapter 15 System Integration Module (SIM).

1.5.4 External Interrupt Pin (IRQ)

IRQ is an asynchronous external interrupt pin. This pin contains an internal pullup resistor. See

Chapter 8 External Interrupt (IRQ).

1.5.5 ADC and ICG Power Supply Pins (VDDA and VSSA)

VDDA and VSSA are the power supply pins for the analog-to-digital converter (ADC) and the internal clock

generator (ICG). Connect the VDDA pin to the same voltage potential as VDD, and the VSSA pin to the

same voltage potential as VSS. Decoupling of these pins should be as per the digital supply. See

Chapter 3 Analog-to-Digital Converter (ADC) and Chapter 7 Internal Clock Generator (ICG) Module).

1.5.6 ADC Reference Pins (VREFH and VREFL)

VREFH and VREFL are the reference voltage pins for the analog-to-digital converter (ADC). VREFH is the

high reference supply for the ADC and should be filtered. VREFH must be connected to the same voltage

potential as the analog supply pin, VDDA. VREFL is the low reference supply for the ADC and should be

externally filtered. VREFL must be connected to the same voltage potential as the analog supply pin VSSA.

See Chapter 3 Analog-to-Digital Converter (ADC).

MC68HC908GT16 â¢ MC68HC908GT8 â¢ MC68HC08GT16 Data Sheet, Rev. 5.0

Freescale Semiconductor

27

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