发明名称 |
EIGHT-BIT MICROCONTROLLER HAVING A RISC ARCHITECTURE |
摘要 |
<p>An eight-bit RISC based microcontroller includes an eight-bit register file having a dedicated arithmetic logic unit (ALU), in addition to a general purpose eight-bit ALU. The register file further includes means for combining a pair of registers to provide a logical sixteen-bit register for indirect addressing. The dedicated ALU is a sixteen-bit ALU which provides certain arithmetic functions for the register pair, thus alleviating the computational burdens that would otherwise be imposed on the general purpose eight-bit ALU. A further feature of the invention is the inclusion of a paging register which is combined with the contents of the logical sixteen-bit register to provide an even greater addressing range. Yet another feature of the eight-bit microcontroller of the present invention is the means for directly reading and writing to any bit position within the register file with a single instruction. This avoids having to perform various load, shift and/or masking operations needed by prior art microcontrollers.</p> |
申请公布号 |
EP1012735(A4) |
申请公布日期 |
2006.05.17 |
申请号 |
EP19980910407 |
申请日期 |
1998.03.13 |
申请人 |
ATMEL CORPORATION |
发明人 |
WOLLAN, VEGARD;BOGEN, ALF-EGIL;MYKLEBUST, GAUTE;BRYANT, JOHN, D. |
分类号 |
G06F9/30;G06F9/32;G06F15/78;(IPC1-7):G06F15/00 |
主分类号 |
G06F9/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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