General Description
●Introduction
●The MC68HC705J1A is a member of Motorola’s low-cost, high-performance M68HC05 Family of 8-bit microcontroller units (MCUs). The M68HC05 Family is based on the customer-specified integrated circuit (CSIC) design strategy. All MCUs in the family use the popular M68HC05 central processor unit (CPU) and are available with a variety of subsystems, memory sizes and types, and package types.
●Features
●Features of the MC68HC705J1A include:
●• Peripheral modules:
●– 15-stage multifunction timer
●– Computer operating properly (COP) watchdog
●• 14 bidirectional input/output (I/O) lines, including:
●– 10-mA sink capability on four I/O pins
●– Mask option register (MOR) and software programmable pulldowns on all I/O pins
●– MOR selectable interrupt on four I/O pins, a keyboard scan feature
●• MOR 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
●– External clock
●• 1240 bytes of EPROM/OTPROM, including eight bytes for user vectors
●• 64 bytes of user random-access memory (RAM)
●• 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 RESETpin to VDD
