MC68HC705J1AC Просмотр технического описания (PDF) - Freescale Semiconductor

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MC68HC705J1AC

Microcontrollers

Freescale Semiconductor 

General Description

Programmable Options

1.4 Programmable Options

The options in Table 1-1 are programmable in the mask option register

(MOR).

Table 1-1. Programmable Options

Feature

COP watchdog timer

External interrupt triggering

Port A IRQ pin interrupts

Port pulldown resistors

STOP instruction mode

Crystal oscillator internal resistor

EPROM security

Short oscillator delay counter

Option

Enabled or disabled

Edge-sensitive only or edge- and level-sensitive

Enabled or disabled

Enabled or disabled

Stop mode or halt mode

Enabled or disabled

Enabled or disabled

Enabled or disabled

1.5 Pin Assignments

Figure 1-2 shows the MC68HC705J1A pin assignments.

1.5.1 VDD and VSS

VDD and VSS are the power supply and ground pins. The MCU operates

from a single power supply.

Very fast signal transitions occur on the MCU pins, placing high,

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

problems, take special care as Figure 1-3 shows, by placing the bypass

capacitors as close as possible to the MCU. C2 is an optional bulk

current bypass capacitor for use in applications that require the port pins

to source high current levels.

MC68HC705J1A — Rev. 4.0

MOTOROLA

General Description

Technical Data

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