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S3C380D Datasheet(PDF) 11 Page - Samsung semiconductor

Part No. S3C380D
Description  Samsung S3C380D 16/32-bit RISC microcontroller is a cost-effective and high-performance microcontroller solution for TV applications.
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Maker  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
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S3C380D Datasheet(HTML) 11 Page - Samsung semiconductor

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S3C380D/F380D
PRODUCT OVERVIEW
1-11
CPU CORE OVERVIEW
The S3C380D CPU core is the ARM7TDMI processor, a general purpose, 32-bit microprocessor developed by
Advanced RISC Machines, Ltd. (ARM). The core's architecture is based on Reduced Instruction Set Computer
(RISC) principles. The RISC architecture makes the instruction set and its related decoding mechanisms simpler
and more efficient than with microprogrammed Complex Instruction Set Computer (CISC) systems. The resulting
benefit is high instruction throughput and impressive real-time interrupt response. Pipelining is also employed so
that all components of the processing and memory systems can operate continuously. The ARM7TDMI has a
32-bit address bus.
An important feature of the ARM7TDMI processor, differentiating it from the ARM7 processor, is a unique
architectural strategy called THUMB. The THUMB strategy is an extension of the basic ARM architecture and
consists of 36 instruction formats. These formats are based on the standard 32-bit ARM instruction set, but have
been re-coded using 16-bit wide opcodes.
Because THUMB instructions are one-half the bit width of normal ARM instructions, they produce very high-
density code. When a THUMB instruction is executed, its 16-bit opcode is decoded by the processor into its
equivalent instruction in the standard ARM instruction set. The ARM core then processes the 16-bit instruction as
it would a normal 32-bit instruction. In other words, the Thumb architecture gives 16-bit systems a way to access
the 32-bit performance of the ARM core without incurring the full overhead of 32-bit processing.
Because the ARM7TDMI core can execute both standard 32-bit ARM instructions and 16-bit Thumb instructions,
it lets you mix routines of Thumb instructions and ARM code in the same address space. In this way, you can
adjust code size and performance, routine by routine, to find the best programming solution for a specific
application.
Instruction
Decoder and
Logic Control
Address Register
Address Register
Register Bank
Write Data Register
Multiplexer
Barrel Shifter
32-Bit ALU
Instruction
Pipeline and
Read Data
Register
Figure 1-12. ARM7TDMI Core Block Diagram


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