INTRODUCTION
General
The MC68HC05E0 is a high-performance fully-expandable ROM-less member of the M68HC05 Family of microcomputers. The M68HC05 CPU core has been enhanced with two powerful, independently controlled timer subsystems, and a serial interface (SI) which can operate in either SPI (Serial Peripheral Interface) or I2C-bus compatible mode. An external 16-bit address/8-bit data expansion bus and chip-select logic are provided to allow access to external ROM, RAM and I/O. The MC68HC05E0, with 480 bytes of on-chip RAM and 36 I/O port lines, is available in a 68-pin PLCC package.

FEATUREs
• Industry-standard M68HC05 core and instruction set
• 64 kbyte address range
• 16-bit address/8-bit data expansion bus to interface to external memory and peripherals
• Address decoder provides select logic for internal and external areas of the memory map
• 480 bytes of on-chip RAM.
• 4 MHz bus frequency
• Programmable system timing control
• 36 I/O lines (four 8-bit bidirectional ports, one 4-bit bidirectional port)
• LED drive capability on 8 I/O pins (Port A)
• 6-bit timer with 8-bit prescaler
• 14-bit timer with 8-bit scaler
• Programmable Real Time Interrupt
• SPI/I²C-bus interface
• Control signals (for emulation purposes)
• Temperature range: 0 - 70 oC