MC68HC908GR16 Datasheet, PDF(25/310 Page) Motorola, Inc – Microcontrollers

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MC68HC908GR16 Datasheet, PDF (25/310 Pages) Motorola, Inc – Microcontrollers

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Freescale Semiconductor, Inc.

General Description

Pin Functions

1.5.4 External Interrupt Pin (IRQ)

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

resistor. See Section 8. External Interrupt (IRQ).

1.5.5 CGM Power Supply Pins (VDDA and VSSA)

VDDA and VSSA 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 Section 4. Clock Generator Module (CGM).

1.5.6 External Filter Capacitor Pin (VCGMXFC)

CGMXFC is an external filter capacitor connection for the CGM. See Section 4.

Clock Generator Module (CGM).

1.5.7 ADC Power Supply/Reference Pins (VDDAD/VREFH and VSSAD/VREFL)

VDDAD and VSSAD are the power supply pins to the analog-to-digital converter

(ADC). VREFH and VREFL are the reference voltage pins for the ADC. VREFH is the

high reference supply for the ADC, and by default the VDDAD/VREFH pin should be

externally filtered and connected to the same voltage potential as VDD. VREFL is the

low reference supply for the ADC, and by default the VSSAD/VREFL pin should be

connected to the same voltage potential as VSS. See Section 3. Analog-to-Digital

Converter (ADC).

1.5.8 Port A Input/Output (I/O) Pins (PTA7/KBD7âPTA0/KBD0)

PTA7âPTA0 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. See Section 12.

Input/Output Ports (PORTS) and Section 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/AD7âPTB0/AD0)

PTB7âPTB0 are general-purpose, bidirectional I/O port pins that can also be used

for analog-to-digital converter (ADC) inputs. See Section 12. Input/Output Ports

(PORTS) and Section 3. Analog-to-Digital Converter (ADC).

1.5.10 Port C I/O Pins (PTC6âPTC0)

PTC6 and PTC5 are general-purpose, bidirectional I/O port pins. PTC4âPTC0 are

general-purpose, bidirectional I/O port pins that contain higher current sink/source

capability. See Section 12. Input/Output Ports (PORTS).

MC68HC908GR16 â Rev. 1.0

MOTOROLA

General Description

For More Information On This Product,

Go to: www.freescale.com

Data Sheet

25

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