Microcontroller unit

• Main Author: KO TAK K. V.,CHENG YAT H.,HATHAWAY EDWARD J.,PICKERING STEPHEN,WOOD MICHAEL C
• Format: Patent
• Language: English
• Published: 14.11.2007
• Subjects: CALCULATING; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION ANDCOMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION ANDCOMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWNENERGY USE; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

A microcontroller unit (MCU) includes a CPU, a system integration module (SIM), and a memory. The CPU decodes instructions to determine the function, an addressing type and an operand address, and converts the operand address to a first address. The SIM converts the first address to a memory address. The memory has a first section addressable via a tiny addressing mode and a second section addressable via a short addressing mode. The tiny and short address spaces can be addressed by a single instruction word. The remaining memory locations can be accessed via alternative addressing modes, such as indirect addressing and paging. The first and second memory sections include mapped registers for indirect addressing, index addressing and paging.