EDSTRG28PLCCCX datasheet(15/78 Pages) TI

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TMS370 MAJOR COMPONENTS ARCHITECTURE

1–7

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key features (continued)

D Memory-mapped ports for easy addressing

D An optimizing C compiler that translates ANSI C programs into TMS370 assembly language source

D A high-level language debugger that lets the user refine and correct code

D A modular library for quickly changing the device configurations

D 18 addressing modes that use eight formats, including:

–

Implied

–

Indirect addressing

–

Indexed and indirect branches and calls

–

PC relative

D 250-mA typical latch-up immunity at 25°C

D Electrostatic discharge (ESD) protection that exceeds 2,000 V per MIL-STD-883C method 3015, making

the TMS370 families Class 2 ESD-sensitive devices

TMS370 major components architecture

In addition to the features listed in the key features section, the TMS370 family members have the following

architectural features. Not all features (key or architectural) are applicable to all devices. The selection reference

guide (see Table 4) summarizes the following features and identifies the applicable devices associated with

those features.

CPU

The TMS370 8-bit CPU has a status register, program-counter register, and stack pointer. The CPU uses the

also allows access to memory and to the peripheral interfaces. TMS370Cx5x and TMS370Cx6x devices all

allow external memory expansion through ports A, B, C, and D.

The register file is located at the beginning of the TMS370 memory map. Register-access instructions in the

TMS370 instruction set allow access to any of the first 256 registers (if available) in one bus cycle. This segment

of the memory map is used as general-purpose RAM and as the stack.

RAM

RAM modules, other than those contained in the register file, are mapped after the register file. The TMS370

accesses this RAM in two cycles.

data EEPROM

With the exception of the TMS370CxAx and TMS370CxCx device groups, certain devices in the TMS370 family

have EEPROM.The data EEPROM modules provide in-circuit programmability and data retention in power-off

mode. The modules contain 256 or 512 bytes of EEPROM. This memory is useful for storing constants and

infrequently changed variables that are required by the application program. The EEPROM can be programmed

and erased by using available EEPROM programmers or by the TMS370 device under program control.

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