COP8SGE5_14 Datasheet, PDF (3/82 Pages) Texas Instruments – COP8SG Family 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART

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Block Diagram
COP8SGE5, COP8SGE7, COP8SGH5
COP8SGK5, COP8SGR5, COP8SGR7
SNOS516E – JANUARY 2000 – REVISED APRIL 2013
Figure 1. COP8SGx Block Diagram
Device Description
ARCHITECTURE
The COP8 family is based on a modified Harvard architecture, which allows data tables to be accessed directly
from program memory. This is very important with modern microcontroller-based applications, since program
memory is usually ROM or EPROM, while data memory is usually RAM. Consequently data tables need to be
contained in non-volatile memory, so they are not lost when the microcontroller is powered down. In a modified
Harvard architecture, instruction fetch and memory data transfers can be overlapped with a two stage pipeline,
which allows the next instruction to be fetched from program memory while the current instruction is being
executed using data memory. This is not possible with a Von Neumann single-address bus architecture.
The COP8 family supports a software stack scheme that allows the user to incorporate many subroutine calls.
This capability is important when using High Level Languages. With a hardware stack, the user is limited to a
small fixed number of stack levels.
INSTRUCTION SET
In today's 8-bit microcontroller application arena cost/performance, flexibility and time to market are several of
the key issues that system designers face in attempting to build well-engineered products that compete in the
marketplace. Many of these issues can be addressed through the manner in which a microcontroller's instruction
set handles processing tasks. And that's why COP8 family offers a unique and code-efficient instruction set—one
that provides the flexibility, functionality, reduced costs and faster time to market that today's microcontroller
based products require.
Code efficiency is important because it enables designers to pack more on-chip functionality into less program
memory space. Selecting a microcontroller with less program memory size translates into lower system costs,
and the added security of knowing that more code can be packed into the available program memory space.
Key Instruction Set Features
The COP8 family incorporates a unique combination of instruction set features, which provide designers with
optimum code efficiency and program memory utilization.
Copyright © 2000–2013, Texas Instruments Incorporated
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Product Folder Links: COP8SGE5 COP8SGE7 COP8SGH5 COP8SGK5 COP8SGR5 COP8SGR7