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TMS320C15PEL Datasheet(PDF) 6 Page - Texas Instruments |
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TMS320C15PEL Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 149 page  SPRS009C – JANUARY 1987 – REVISED JULY 1991 TMS320C1x DIGITAL SIGNAL PROCESSORS POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001 6 interrupts and subroutines All devices except the ′C16 contain a four-level stack for saving the contents of the program counter during interrupts and subroutine calls. Because of the larger 64K program space, the ′C16’s hardware stack has been increased to eight levels. Instructions are available for saving the device’s complete context. PUSH and POP instructions permit a level of nesting restricted only by the amount of available RAM. The interrupts used in these devices are maskable. input/output The 16-bit parallel data bus can be utilized to perform I/O functions in two cycles. The I/O ports are addressed by the three LSBs on the address lines. In addition, a polling input for bit test and jump operations (BIO) and an interrupt pin (INT) have been incorporated for multitasking. The bit selectable I/O of the ′C14 is suitable for microcontroller applications. serial port (TMS320C17/E17) Two of the I/O ports on the ′C17/E17 are dedicated to the serial port and companding hardware. I/O port 0 is dedicated to control register 0, which controls the serial port, interrupts, and companding hardware. I/O port 1 accesses control register 1, as well as both serial port channels, and companding hardware. The six remaining I/O ports are available for external parallel interfaces. serial port (TMS320C14/E14) The ′C14/E14 devices include one I/O-mapped serial port that operates asynchronously. I/O-mapped control registers are used to configure port parameters such as inter-processor communication protocols and baud rate. companding hardware (TMS320C17/E17) On-chip hardware enables the ′C17/E17 to compand (COMpress/exPAND) data in either µ-law or A-law format. The companding logic operation is configured via the system control register. Data may be companded in either serial mode for operation on serial port data (converting between linear and logarithmic PCM) or a parallel mode for computation inside the device. The ′C17/E17 allows the hardware companding logic to operate with either sign-magnitude or twos-complement numbers. coprocessor port (TMS320C17/E17) The coprocessor port on the ′C17/E17 provides a direct connection to most microcomputers and microprocessors. The port is accessed through I/O port 5 using IN and OUT instructions. The coprocessor interface allows the device to act as a peripheral (slave) microcomputer to a microprocessor, or as a master to a peripheral microcomputer. In the microcomputer mode, the 16 data lines are used for the 6 parallel 16-bit I/O ports. In the coprocessor mode, the 16-bit parallel port is reconfigured to operate as a 16-bit latched bus interface. For peripheral transfer, an 8-bit or 16-bit length of the coprocessor port can be selected. |
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