The TMS370C020A, TMS370C022A, TMS370C320A, TMS370C322A, TMS370C722, and SE370C722 devices are members of the TMS370 family of single-chip 8-bit microcontrollers. Unless otherwise noted, the term TMS370Cx2x refers to these devices. The TMS370 family provides cost-effective real-time system control through integration of advanced peripheral modules and various function on-chip memory configurations.
The TMS370Cx2x family uses high-performance silicon-gate CMOS EPROM and EEPROM technology. Low operating power, wide operating temperature range, and noise immunity of CMOS technology coupled with the high performance and extensive on-chip peripheral functions make the TMS370Cx2x devices attractive in system designs for automotive electronics, industrial motor, computer peripheral controls, telecommunications, and consumer applications.
All TMS370Cx2x devices contain the following on-chip peripheral modules:
Serial peripheral interface (SPI)
Serial communications interface 1 (SCI1)
One 24-bit general-purpose watchdog (WD) timer
One 16-bit general-purpose timer with an 8-bit prescaler
Table 1 lists memory configurations of the TMS370Cx2x devices.
The suffix letter A appended to the device names in Table 1 indicates the configuration of the devices. ROM or EPROM devices have different configurations as indicated in Table 2. ROM devices with the suffix letter A are configured through a programmable contact during manufacture.
The 4K bytes and 8K bytes of mask-programmable ROM in the TMS370C020, TMS370C022, TMS370C320, and TMS370C322 are replaced in the TMS370C722 and SE370C722 with 8K bytes of EPROM. All other available memory and on-chip peripherals are identical, except there are no data EEPROMs on the TMS370C320 and TMS370C322 devices. OTP (TMS370C722) devices and the reprogrammable device (SE370C722) are available.
TMS370C722 (OTP) devices are in plastic packages. This microcontroller is effective to use for immediate production updates for other memebers of the TMS370Cx2x family or for low-volume production runs when the mask charge or cycle time for the low-cost mask ROM devices is not practical.
The SE370C722 has a windowed ceramic package to allow reprogramming of the program EPROM memory during the prototyping phase of design. These SE370C722 devices allow quick updates to breadboards and prototype systems while creating multiple initial designs.
The TMS370Cx2x family provides two low-power modes (STANDBY and HALT) for applications where low power consumption is critical. Both modes stop all central processing unit (CPU) activity (that is, no instructions are executed). In the STANDBY mode, the internal oscillator, the general-purpose timer, and the SCI receiver start-bit detection remain active. In the HALT mode, all device activity is stopped. The device retains all RAM data and peripheral configuration bits throughout both low-power modes.
The TMS370Cx2x features advanced register-to-register architecture that allows arithmetic and logical operations without requiring an accumulator (e.g., ADD R24, R47; add the contents of register 24 to the contents of register 47 and store the result in register 47). The TMS370Cx2x family is fully instruction-set-compatible, providing easy transition between members of the TMS370 8-bit microcontroller family.
The SPI provides a convenient method of serial interaction for high speed communications between simpler shift-register type devices, such as display drivers, analog-to-digital (A/D) converter, PLL, I/O expansion, or other microcontrollers in the system.
The TMS370Cx2x devices have two operational modes of serial communications provided by the SCI1 module.The SCI1 allows standard RS-232-C communications with other common data transmission equipment.
The TMS370Cx2x family provides the system designer with an economical, efficient solution to real-time control applications. The TMS370 family extended development system (XDSTM) and compact development tool (CDTTM) meet the challenge of efficiently developing the software and hardware required to design the TMS370Cx2x into complex applications. The application source code can be written in assembly and C language, and the output code can be generated by the linker. The TMS370 family XDS development tool communicates through a standard RS-232-C interface with a personal computer. This allows the use of the personal computer editors and software utilities already familiar to the designer. The TMS370 family XDS emphasizes ease-of-use through extensive menus and screen windowing so that a system designer can begin developing software with minimal training. Precise real-time in-circuit emulation and extensive symbolic debug and analysis tools ensure efficient software and hardware implementation as well as a reduced time-to-market cycle.
CMOS/EEPROM/EPROM Technologies on a Single Device
Mask-ROM Devices for High-Volume Production
One-Time-Programmable (OTP) EPROM Devices for Low-Volume Production
Reprogrammable-EPROM Devices for Prototyping Purposes
Internal System Memory Configurations
On-Chip Program Memory Versions
ROM: 4K or 8K Bytes
EPROM: 8K Bytes
Data EEPROM: 256 Bytes
Static RAM: 256 Bytes Usable as Registers
Flexible Operating Features
Low-Power Modes: STANDBY and HALT
Commercial, Industrial, and Automotive Temperature Ranges
Clock Options
Divide-by-1 (2 MHz - 5MHz SYSCLK) PLL
Divide-by-4 (0.5 MHz - 5 MHz SYSCLK)
Supply Voltage (VCC) 5 V ±10%
16-Bit General-Purpose Timer
Software Configurable as a 16-Bit Event Counter, or a 16-Bit Pulse Accumulator, or a 16-Bit Input Capture Function, or Two Compare Registers, or a Self-Contained Pulse-Width-Modulation (PWM) Function
Software Programmable Input Polarity
8-Bit Prescaler, Providing a 24-Bit Real-Time Timer
On-Chip 24-Bit Watchdog Timer
\- Mask-ROM Devices: Hard Watchdog, Simple Counter, or Standard Watchdog
Flexible Interrupt Handling
Serial Peripheral Interface (SPI)
Serial Communications Interface 1 (SCI1)
TMS370 Series Compatibility
Register-to-Register Architecture
128 or 256 General-Purpose Registers
14 Powerful Addressing Modes
Instructions Upwardly Compatible With All TMS370 Devices
CMOS/TTL Compatible I/O Pins/Packages
All Peripheral Function Pins Software Configurable for Digital I/O
33 Bidirectional Pins, 1 Input Pin
44-Pin Plastic and Ceramic Leaded Chip Carrier (LCC) Packages
40-Pin Plastic and Ceramic Dual-In-Line (DIP) Packages
Workstation/PC-Based Development System
C Compiler and C Source Debugger
Real-Time In-Circuit Emulation
Extensive Breakpoint/Trace Capability
Multi-Window User Interface
Microcontroller Programmer
XDS and CDT are trademarks of Texas Instruments Incorporated.
