The TMS370C040A, TMS370C042A, TMS370C340A, TMS370C342A, TMS370C742A, and SE370C742A devices are members of the TMS370 family of single-chip 8-bit microcontrollers. Unless otherwise noted, the term TMS370Cx4x refers to these devices. TMS370 family provides cost-effective real-time system control through integration of advanced peripheral function modules and various on-chip memory configurations.
The TMS370Cx4x family is implemented using high-performance silicon-gate CMOS EPROM and EEPROM technology. The 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 TMS370Cx4x devices attractive in system designs for automotive electronics, industrial motor, computer peripheral control, telecommunications, and consumer applications.
The TMS370Cx4x devices contain the following on-chip peripheral modules:
Two 16-bit general-purpose timers (one with an 8-bit prescaler)
One 24-bit general-purpose watchdog timer
Table 1 provides an overview of the various memory configurations of the TMS370Cx4x devices.
The suffix letter (A) appended to the device name (shown in the first column of Table 1) indicates the configuration of the device. ROM and 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 TMS370C040A, TMS370C042A, TMS370C340A and TMS370C342A are replaced in the TMS370C742 with 8K bytes of EPROM while all other available memory and on-chip peripherals are identical, with the exception of no data EEPROM on the TMS370C340A and TMS370C342A devices. The OTP (TMS370C742A) device and the reprogrammable device (SE370C742A) are available.
TMS370C742A (OTP) devices are available in plastic packages. This microcontroller is effective to use for immediate production updates for other members of the TMS370Cx4x 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 SE370C742A has a windowed ceramic package to allow reprogramming of the program EPROM memory during the development/prototyping phase of design. The SE370C742A device allows quick updates to breadboards and prototype systems while iterating initial designs.
The TMS370Cx4x 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 and the general-purpose timer 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 TMS370Cx4x 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 TMS370Cx4x family is fully instruction-set-compatible, allowing easy transition between members of the TMS370 8-bit microcontroller family.
The TMS370Cx4x family offers an 8-channel ADC1 with 8-bit accuracy for the 44-pin PLCC packages and also offers a 4-channel ADC1 for the 40-pin DIP packages. The 33-us conversion time at 5-MHz SYSCLK and the variable sample period, combined with selectable positive reference voltage sources, turn analog signals into digital data.
The serial communications interface 1 (SCI1) module is a built-in serial interface that can be programmed to be asynchronous or isosynchronous to give two methods of serial commnications. The SCI allows standard RS-232-C communications with other common data transmission equipment. The CPU takes no part in serial communications except to write data to be transmitted to a register and to read data received from a register.
The TMS370Cx4x familiy provides the system designer with very economical, efficient solutions to real-time control applications. The TMS370 family extended development system (XDSTM) and compact development tool (CDTTM) solve the challenge of efficiently developing the software and hardware required to design the TMS370Cx4x into an ever-increasing number of complex applications. The application source code can be written in assembly and C languages, and the output code can be generated by the linker. The TMS370 family XDS communicates through a standard RS-232-C interface with a personal computer, allowing use of the personal computer editors and software utilities already familiar to the designer. The TMS370 family XDS emphasizes ease-of-use through extensive use of menus and screen windowing so that a system designer with minimal training can begin developing software. Precise real-time in-circuit emulation and extensive symbolic debug and analysis tools ensure efficient software and hardware implementation, as well as reduced time-to-market cycle.
The TMS370Cx4x family together with the TMS370 family XDS, CDT370, starter kit, software tools, the SE370C742A reprogrammable devices, comprehensive product documentation, and customer support provide a complete solution for the needs of the system designer.
CMOS/EEPROM/EPROM Technologies on a Single Device
Mask-ROM Devices for High Volume Production
One-Time-Programmable (OTP) Devices for Low-Volume Production
Reprogrammable EPROM Devices for Prototyping Purposes
Flexible Operating Features
Low-Power Modes: STANDBY and HALT
Commercial, Industrial, and Automotive Temperature Ranges
