MC68HC908GZ8 Datasheet, PDF(27/344 Page) Motorola, Inc – Microcontrollers

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MC68HC908GZ8 Datasheet, PDF (27/344 Pages) Motorola, Inc – Microcontrollers

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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 12. 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 7. Clock Generator Module (CGM).

1.5.6 External Filter Capacitor Pin (VCGMXFC)

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

Section 7. 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 5. 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. PTA7âPTA4 are

only available on the 48-pin LQFP package. See Section 17. Input/Output (I/O)

Ports and Section 13. 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. PTB7âPTB4 are only available on the

48-pin LQFP package. See Section 17. Input/Output (I/O) Ports and Section 5.

Analog-to-Digital Converter (ADC).

MC68HC908GZ8

Freescale Semiconductor

General Description

Data Sheet

27

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