Electrical computers and digital processing systems: processing – Processing architecture – Microprocessor or multichip or multimodule processor having...
Patent
1997-01-24
1999-09-21
Shah, Alpesh M.
Electrical computers and digital processing systems: processing
Processing architecture
Microprocessor or multichip or multimodule processor having...
710 14, G06F 1576
Patent
active
059548134
ABSTRACT:
A data processor such as an integrated circuit microcontroller (10) includes a central processing unit (12), a system integration module (14), and on-chip peripherals (16, 24, 28, 30) commonly connected by an information bus (32). The microcontroller (10) supports transparent background mode operation by not only preserving the state of the central processing unit (12), but also the states of on-chip peripherals (16, 24, 28, 30). For example, a serial peripheral interface (16) has a status register (86) with some status bits which are cleared in normal mode by reading the status register (86). In background mode, reading the status register (86) does not cause the status bits to be cleared. The system integration module (14) has a control bit, known as the break clear flag enable (BCFE) bit, which selectively allows the states of the on-chip peripherals (16, 24, 28, 30) to be altered when the microcontroller is in background mode.
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Mann Shari L.
McKinnon Gordon W.
Pena David J. A.
Studor Charles F.
Motorola Inc.
Polansky Paul J.
Shah Alpesh M.
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