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TMS370C758A Datasheet(PDF) 7 Page - Texas Instruments |
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TMS370C758A Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 77 page  TMS370Cx5x 8-BIT MICROCONTROLLER SPNS010F – DECEMBER 1986 – REVISED FEBRUARY 1997 7 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 description (continued) For large memory applications, the TMS370Cx5x family provides an external bus with non-multiplexed address and data. Precoded memory chip-select outputs can be enabled, which allows minimum-chip-count system implementations. Wait-state support facilitates performance matching among the CPU, external memory, and the peripherals. All pins associated with memory expansion interface are individually software configurable for general purpose digital input/output (I / O) pins when operating in the microcomputer mode. The TMS370Cx5x family provides the system designer with very economical, efficient solution to real-time control applications. The TMS370 family extended development system (XDS ™) and compact development tool (CDT ™) solve the challenge of efficiently developing the software and hardware required to design the TMS370Cx5x into an ever-increasing number of 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 tools communicate through a standard RS-232-C interface with an existing 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 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 TMS370Cx5x family together with the TMS370 family XDS/22, CDT370, design kit, starter kit, software tools, the SE370C75x reprogrammable devices, comprehensive product documentation, and customer support provide a complete solution to the needs of the system designer. modes The TMS370Cx5x has four operating modes, two basic modes with each mode having two memory configurations. The basic operating modes are the microcomputer and microprocessor modes, which are selected by the voltage level applied to the dedicated MC pin two cycles before RESET goes inactive. The two memory configurations then are selected through software programming of the internal system configuration registers. The four operating modes are the microcomputer single chip, microcomputer with external expansion, microprocessor without internal program memory, and microprocessor with internal program memory. These modes are described in the following list. D Microcomputer single chip mode: – Operates as a self-contained microcomputer with all memory and peripherals on-chip. – Maximizes the general-purpose I/O capability for real-time control applications. D Microcomputer with external expansion mode: – Supports bus expansion to external memory or peripherals, while all on-chip memory (RAM, ROM, EPROM, and data EEPROM) remains active. – Configures digital I/O ports (ports A, B, C, and D) through software, under control of the associated port control, to become external memory as follows: – Port A: 8-bit data memory – Port B and C: 16-bit address memory – Port D: 8-bit control memory (pin not used as function A or B can be configured as I/O) – Utilizes the pins available (not used for address, data, or control memory) as general-purpose input/output by programming them individually. – Lowers the system cost by not requiring an external address/data latch (address memory and data memory are nonmultiplexed). XDS and CDT are trademarks of Texas Instruments Incorporated. |
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