MC68HC05E6FB 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC68HC05E6FB

HCMOS Microcontroller Unit

Freescale Semiconductor 

Freescale Semiconductor, Inc.

Modes of Operation and Pin Descriptions

VDD and VSS

Power is supplied to the microcontroller using these two pins. VDD is the

positive supply and VSS is ground.

It is in the nature of CMOS designs that very fast signal transitions occur

on the MCU pins. These short rise and fall times place very high

short-duration current demands on the power supply. To prevent noise

problems, special care must be taken to provide good power supply

bypassing at the MCU. Bypass capacitors should have good high

frequency characteristics and be as close to the MCU as possible.

Bypassing requirements vary, depending on how heavily the MCU pins

are loaded.

IRQ/VPP

This is an input-only pin for external interrupt sources. Interrupt triggering

can be selected to be negative edge sensitive or negative edge-and-level

sensitive by correctly configuring the IRQ bit in the LVIOPT register (see

Mask options). The IRQ pin contains an internal Schmitt trigger as part of

its input to improve noise immunity. For the MC68HC705E6, this pin also

serves as the input pin for the EPROM programming voltage (VPP).

OSC1, OSC2

Crystal

These pins provide control input for an on-chip oscillator circuit. A

crystal, ceramic resonator or external clock signal connected to these

pins supplies the oscillator clock. The oscillator frequency (fOSC) is

divided by two to give the internal bus frequency (fOP).

The circuit shown in Figure 5(a) is recommended when using either a

crystal or a ceramic resonator. Figure 5(e) provides the recommended

capacitance and feedback resistance values. The internal oscillator is

designed to interface with an AT-cut parallel-resonant quartz crystal

resonator in the frequency range specified for fOSC (see Table 23). Use

of an external CMOS oscillator is recommended when crystals outside

the specified ranges are to be used. The crystal and associated

components should be mounted as close as possible to the input pins to

minimise output distortion and start-up stabilization time. The

manufacturer of the particular crystal being considered should be

consulted for specific information.

MC68HC05E6 — Rev. 1.0

6-pin

Modes of Operation and Pin Descriptions

For More Information On This Product,

Go to: www.freescale.com

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