Content for 68HC000


The 68HC000, the first CMOS version of the 68000, was designed by Hitachi and jointly introduced in 1985. Motorola's version is called the MC68HC000, while Hitachi's is the HD68HC000. The 68HC000 offers speeds of 8–20 MHz. Except for using CMOS circuitry, it behaved identically to the HMOS MC68000, but the change to CMOS greatly reduced its power consumption. The original HMOS MC68000 consumed around 1.35 watts at an ambient temperature of 25 °C, regardless of clock speed, while the MC68HC000 consumed only 0.13 watts at 8 MHz and 0.38 watts at 20 MHz. (Unlike CMOS circuits, HMOS still draws power when idle, so power consumption varies little with clock rate.) Apple selected the 68HC000 for use in the Macintosh Portable.

Project  68k nano

68k nano

“A minimal single-board computer based on the venerable “Texas Cockroach” Motorola 68000 16/32-bit microprocessor. Features 68HC000 processor running at 12MHz 1MB RAM 64KB ROM 16550 UART providing a 5V FTDI serial port 44-pin IDE connector for CompactFlash card adapter …