TMS370C020A

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Unless otherwise noted, all voltage values are with respect to V_SS.
              2. Electrical characteristics are specified with all output buffers loaded with specified I_O current. Exceeding the specified I_O current in any buffer can affect the levels on other buffers.

The TMS370Cx2x 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 4K bytes and 8K bytes of mask-programmable ROM in the TMS370Cx2x 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 members 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 TMS370Cx2x 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 (XDS^TM) and compact development tool (CDT^TM) 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.