发明名称 |
Microcomputer with internal selection of on-chip or off-chip access |
摘要 |
A microcomputer device contains a CPU with an arithmetic/logic unit and data/address registers on a single semiconductor integrated circuit having on-chip macrocode and microcode storage. In the normal single-chip operation mode, a macrocode word is fethched from on-chip ROM and stored in an instruction register in the CPU, then a sequence of microcode words is fetched from the microcode store based on this macrocode word. In another mode, such as used for self-test employing a check-code, the device loads macrocode from external into on-chip RAM then executes from RAM to perform the desired routine, switching modes of operation.
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申请公布号 |
US4580216(A) |
申请公布日期 |
1986.04.01 |
申请号 |
US19810276412 |
申请日期 |
1981.06.22 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
BELLAY, JEFFREY D.;MCDONOUGH, KEVIN C.;PATRICK, MICHAEL W. |
分类号 |
G06F9/24;G06F9/26;G06F9/48;(IPC1-7):G06F9/22 |
主分类号 |
G06F9/24 |
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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