MC68HC705KJ1 Datasheet, PDF (13/108 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Chapter 1
Introduction
1.1 Features
Features on the MC68HC705KJ1 include:
• Robust noise immunity
• 4.0-MHz internal operating frequency at 5.0 V
• 1240 Bytes of EPROM/OTPROM (electrically programmable read-only memory/one-time
programmable read-only memory), including eight bytes for user vectors
• 64 bytes of user RAM
• Peripheral modules:
– 15-stage multifunction timer
– Computer operating properly (COP) watchdog
• 10 bidirectional input/output (I/O) lines, including:
– 10-mA sink capability on all I/O pins
– Software programmable pulldowns on all I/O pins
– Keyboard scan with selectable interrupt on four I/O pins
– 5.5-mA source capability on six I/O pins
• Selectable sensitivity on external interrupt (edge- and level-sensitive or edge-sensitive only)
• On-chip oscillator with connections for:
– Crystal
– Ceramic resonator
– Resistor-capacitor (RC) oscillator (MC68HRC705KJ1) with or without external resistor
– External clock
– Low-speed (32-kHz) crystal (MC68HLC705KJ1)
• Memory-mapped I/O registers
• Fully static operation with no minimum clock speed
• Power-saving stop, halt, wait, and data-retention modes
• External interrupt mask bit and acknowledge bit
• Illegal address reset
• Internal steering diode and pullup resistor from RESET pin to V_DD
• Selectable EPROM security⁽¹⁾
• Selectable oscillator bias resistor
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the EPROM/OTPROM
difficult for unauthorized users.
MC68HC705KJ1 • MC68HRC705KJ1 • MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
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