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关于MC68HC705J1A单片机：
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.On-chip memory of the MC68HC705J1A includes 1240 bytes of erasable, programmable read-only memory (EPROM). In packages without the transparent window for EPROM erasure, the 1240 EPROM bytes serve as one-time programmable read-only memory (OTPROM).The MC68HRC705J1A is a resistor-capacitor (RC) oscillator mask option version of the MC68HC705J1A .
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 RESET pin to VDD
