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AN1746

Features: • 1240 bytes of user EPROM• 64 bytes of low-power user RAM• 4-MHz maximum internal bus frequency at 5 volts• 15-stage multifunction timer• COP watchdog timer• 10 bidirectional input/output (I/O) pins, including: 10-mA sink capability on all I/O pins 5....

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AN1746: Features: • 1240 bytes of user EPROM• 64 bytes of low-power user RAM• 4-MHz maximum internal bus frequency at 5 volts• 15-stage multifunction timer• COP watchdog timer&...

AN1746 Data Sheet

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Part Number:
AN1746
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

• 1240 bytes of user EPROM
• 64 bytes of low-power user RAM
• 4-MHz maximum internal bus frequency at 5 volts
• 15-stage multifunction timer
• COP watchdog timer
• 10 bidirectional input/output (I/O) pins, including:
10-mA sink capability on all I/O pins
5.5-mA source capability on six I/O pins
Software programmable pulldowns on all I/O pins
Keyboard scan with selectable interrupt on four I/O pins
• Selectable sensitivity on external interrupt; edge- and levelsensitive r edge-sensitive only
• On-chip oscillator with options for:
Crystal
Ceramic resonator
Resistor-capacitor (RC) oscillator (MC68HRC705KJ1) with or ithout external resistor
Low-speed (32 kHz) crystal (MC68HLC705KJ1)
External clock
• External interrupt mask bit and acknowledge bit
• EPROM security bit1 to aid in locking out access to programmable PROM array
• Selectable STOP conversion to HALT and option for fast restart nd power-on reset
• Internal steering diode and pullup device on RESET pin to VDD


Application

For information on migrating your design to the K3, consult the pplication note titled Migrating from the MC68HC705K1 to the C68HC805K3, Freescale document order number AN1747/D.




Pinout

Connection Diagram


Description

Freescale provides two different parts of AN1746 to migrate your current C68HC705K1 (K1) application easily. Depending on your design, system enhancements, and cost, the MC68HC705KJ1 (KJ1) and the C68HC805K3 (K3) provide two different migration paths.

The major differences between the KJ1 and the K3 are:
• Price
• Pinout compatibility

The KJ1 is not pin for pin the same as the K1, but it is roughly 70% the ost of the K1. Although the K3 is pin for pin the same as the K1, it is oughly 90% the cost of the K1.

This AN1746 application note illustrates the differences between the K1 and the J1. Using the KJ1's additional features can further enhance your ystem design. Consult the K1 and KJ1 databooks for detailed design eference. See References/Additional Reading in this application note.




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