Intel 8253
The Intel 8253 is a programmable counter / timer module ( programmable interval timer , PIT ), the primary for the Intel-8080 / 8085 processor was developed. Later was chip together with the Intel 8086 / 8088 used and his successors. The component is mainly supplied in a 24-pin DIL housing . He was u. a. licensed to Mitsubishi Electric , National Semiconductor , NEC and Siemens . It has been used since the first PCs ( IBM-PC and IBM-PC XT ). The 8254 as a slightly improved version was used in the IBM PC AT .
properties
The 8253 contains three independently working 16-bit counters, which work up to a counting frequency of 2 MHz. The various operating modes can be set using the software in the microcomputer system.
Literature and data sheets
- Microcomputer modules, data book 1979/80, volume 3, peripherals, Siemens AG, order number B 2049, pp. 102–123.
- NEC Electronics (Europe) GmbH, 1982 Catalog, pp. 649-656.
- Intel's documentation for the 8254 chip (PDF; 302 kB)
- 82C54 Datasheet ( GZIP ; 192 kB)
Web links
Individual evidence
- ↑ Chemnitz University of Technology: The structure of the original IBM PC motherboard ( Memento of the original from December 8, 2011 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. .
- ↑ Chemnitz University of Technology: The AT motherboard ( Memento of the original from January 6, 2012 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. .
