WDC 65816/65802

Categories: FOLDOC sourced articles | Microprocessors | 65xx microprocessors

The WDC 65816 (also: 65C816), a 16-bit microprocessor CPU developed by the Western Design Center (WDC), is an expanded and compatible successor to the venerable MOS Technology 6502. The WDC 65802 (also: 65C802) is a 65816 CPU in a 6502-pinout package (fully 6502 compatible). The 65816 was second-sourced by GTE, Sanyo and a couple of other semiconductor companies from the mid-to-late 1980s to the early 1990s. As of 2005 it is still sold by WDC, and is also used as an CPU core in some systems, such as Winbond's W55V9x series of TV Edutainment ICs.

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Description of the 65802

The 65802 was produced by WDC and GTE during the mid-to-late 1980s. The chip was designed as an upgrade path from the 8-bit 6502/65C02 to the new 65816 16-bit CPU. To do this, the 65802 has a 16-bit address bus like the 6502/65C02 (64K memory space), reduced from the 24-bit address bus of the 65816. All of the bank select registers, etc., from the 65816, are still intact in the 65802 CPU core, they just have no effect when used. Typically, when hardware manufacturers have designed a project from the ground up, they have used the more powerful 65816.

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References

Eyes, David; Lichty, Ron (1986). Programming the 65816 including the 6502, 65C02, and 65802. New York: Brady Books/Prentice Hall Press (Simon & Schuster, Inc). ISBN 0-89303-789-3.

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External links

W65C816S information on WDC's website – Including a link to the PDF-format datasheet
A 6502 Programmer's Introduction to the 65816 – By Brett Tabke, with instruction set summary from Creative Micro Designs.
Winbond TV Edutainment IC Selection Guide – ICs with 65816 CPU core

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.

Image:MOSlogo small black.gif 65xx family products from MOS Technology (CSG/GMT), second-source and clone makers, and the Western Design Center (WDC) Image:WDClogo small.gif

Single board computer/evaluation kit: MOS/CBM KIM-1 | 8-bit microprocessor CPUs: 4510 | 6501 | 6502 | 65C02 | HuC6280 | 6507 | 6508 | 6509 | 6510/7501/8500-01 | 8502
16-bit CPUs: 65802 | 65816

Interface chips: 6520 PIA | 6522 VIA | 6526 CIA | 6529 SPIA | 6530 RRIOT | 6532 RIOT | 6551 ACIA | Sound/graphics chips: 6545 CRTC | 6560 VIC | 6567 VIC-II | 6581 SID | 7360 TED | 8563 VDC | 8568 VDC

de:Western Design Center 65816 es:WDC 65C816 nl:65816 (processor) ja:65816

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