Motorola 6805
6805 is a family of microcontrollers from Motorola (today Freescale ).
Based on a processor core derived from the Motorola 6800 , Motorola developed the MC6805, one of the first widely used microcontroller families. The MC6805 family was based on the HMOS process, and the chips combined not only the processor but also peripheral functions, RAM and ROM or EEPROM on one chip. There was also a smaller family of chips based on the CMOS process, which was called the MC146805.
The different variants of the chips were distinguished by the combination of a letter and a number following the "MC6805". Chips with EPROM were labeled as "MC68705xx", those with ROM as "MC6805xx". So was z. B. the MC68705P3 a chip with 1.8 KB EPROM and 20 I / O lines, which was often used in keyboards. Chips with ROM had to be provided with the desired program when they were manufactured - a process that is also known as "mask ROM".
In addition to Motorola, Hitachi also manufactured chips with the 6805 architecture.
The 6805 chips were replaced in the 1980s by the 68HC05 , which has an extended instruction set and uses less power.
Web links
- Overview of Motorola processor families, including 6805 (PDF file; 628 kB)
Complete data sheets are unlikely to be found on the Internet, as the 6805 was discontinued before the advent of the WWW.