TMS370

The TMS370 family is based on a register-to-register architecture that allows access to a register file (up to 256 bytes) in a single bus cycle. On-chip memory includes program memory (mask ROM or EPROM), static RAM, standby RAM, and data EEPROM.

The versatile on-chip peripheral functions include an analog-to-digital converter (ADC1, ADC2, or ADC3), a serial communications interface (SCI1 or SCI2), a serial peripheral interface (SPI), three different timer modules (T1, T2A, and T2B), and up to 55 digital input/ output (I /O) pins. The number and type of peripheral functions (modules) is dependent on the TMS370 subfamily.

The following are key features of the TMS370 device family (not all features are available for all devices):
`  Compatibility for supporting software migration between current and future microcontrollers
`  CMOS EPROM technology for providing reprogrammable EPROM and one-time programmable (OTP)
   program memory for prototypes and for small-volume or quick-turn production
` CMOS EEPROM technology for providing EEPROM programming with a single 5-V supply
` ADC technology for converting analog signals to digital values
` Static RAM/register file registers that offer numerous memory options
` Standby RAM that offers data protection in power-off condition
` Programmable (asynchronous and isosynchronous†) built-in serial communications interface for control of timing, data format, and protocol
` Serial peripheral interface for providing single-mode synchronous data transmission from the CPUs to any
external peripheral devices
` Flexible operating features:
   Power-reduction-standby and halt modes
   Temperature options: 0°C to 70°C operating temperature (L)
   40°C to 85°C operating temperature (A)
   40°C to 105°C operating temperature (T)
   Input clock frequency options:
       Divide-by-4 ( 0.5 MHz to 5 MHz SYSCLK ) standard oscillator
       Divide-by-1 ( 2 MHz to 5 MHz SYSCLK) phase-locked loop (PLL)
   Operating voltage range: 5 V +10%
` Flexible interrupt handling for design flexibility:
   Two programmable interrupt levels
   Programmable rising-edge or falling-edge detect
` System integrity features that increase flexibility during the software development phase
   Oscillator fault detection
   Privileged mode lockout
   Watchdog timer
   Memory security (for ROM)
` Memory-mapped ports for easy addressing
` An optimizing C compiler that translates ANSI C programs into TMS370 assembly language source
` A high-level language debugger that lets the user refine and correct code
` A modular library for quickly changing the device configurations
` 18 addressing modes that use eight formats, including:
   Implied
   Register-to-register arithmetic
   Indirect addressing
   Indexed and indirect branches and calls
   PC relative
` 250-mA typical latch-up immunity at 25°C
` Electrostatic discharge (ESD) protection that exceeds 2,000 V per MIL-STD-883C method 3015, making the TMS370 families Class 2 ESD-sensitive devices

The TMS370 family consists of very large scaled integration (VLSI), 8-bit, complementary metal oxide semiconductor (CMOS) microcontrollers with on-chip EEPROM storage and peripheral-support functions. These devices offer superior performance in complex, real-time control applications in demanding environments and are available in mask-programmable ROM and EPROM.

In a continual effort to improve its products, Texas Instruments has added new, more robust features to the TMS370 family of devices that are designed to enhance performance and enable new application technologies. These added features include new watchdog modes and low-power modes for mask-ROM devices. All family members are software compatible, so that many existing applications can be run on the improved devices without modification of software. (Refer to the associated data sheets for more information on compatibility.)

In expanding its powerful TMS370 family of microcontrollers, TI™ offers many new configurable devices for specific applications. As microcontrollers have evolved, TI has added multiple peripheral functions to chips that originally had only a central processing unit (CPU), memory, and I/O blocks. Now, with the high-performance, software-compatible TMS370 microcontrollers, over 130 standard products are available. Also, up to 27 function modules can be used to configure a new device quickly, easily, and cost-effectively for any applications.

The TMS370 family is supported fully by TI development tools that facilitate simplified software development for prompt market introduction of new products. These tools include an assembler, an optimizing C compiler, a linker, a C source debugger, a design kit, a starter kit, and a third-party microcontroller programmer from BP Microsystems. All of these tools work together by using an IBM™-compatible personal computer (PC) as the host and the central control element. This allows the user to select the host computer and text management as well as editing tools according to system requirements.

Additionally, the TMS370 in-circuit emulator [XDS™-extended development support, and CDT370 compact development tool (CDT™)] allows the user to immediately begin designing, testing, and debugging the system upon specification. The reason for this is straightforward: the emulator itself is modular and configurable, thereby eliminating the need to produce a new emulator for each TMS370 configuration.