TMS320C14 Features

The TMS320C14 is object-code compatible with the TMS320C10.

The 'C14 provides 256 16-bit words of internal data memory and either 4K 16-bit words of internal or 4K 16-bit words of external program ROM. It is also available in a one-time programmable (OTP) version.

The 'C14 integrates multiple control peripherals for a single-chip control system solution.

Features of the TMS320C14 include:

• 160-ns instruction cycle time
• 4K-word external address reach
• Watchdog timer
• 16-bit selectable I/O pins
• Asynchronous serial port
• Event manager
• Microprocessor and microcomputer modes
• TMS320C10 object-code compatibility
• 68-pin PLCC package
• One-time programmable (TMS320P14) version

TMS320C14 Peripherals

The on-chip 'C14 peripherals:

• Are designed to meet the I/O requirements of control applications
• Are mapped into I/O memory space
• Are accessed through the bank select register (BSR) and in/out instructions
• Operate without CPU intervention

Watchdog timer: The watchdog timer is used to prevent software hang-ups. If the watchdog timer is not reset as expected, it sends an external interrupt that is commonly used to reset the processor.

General-purpose I/O port: The general-purpose I/O port has 16 individual I/O pins. These I/O pins can be used to monitor and control external events within the system.

Serial port: The on-chip UART is double buffered and operates at up to 400 kbps in a full-duplex transceiver mode.

Event manager: The event manager consists of compare and capture sections, which run without CPU intervention.

Compare: The compare system compares each of six internal registers to either of the on-chip timers. If the contents of any compare are equal, then a programmable set of actions is taken to set, reset, or toggle the associated compare output pins. Designers commonly use this system to create a pulse width modulation (PWM) output. The compare system has a special mode for PWM output, which increases the PWM resolution to 40 ns.

Capture: The capture system provides a logging function for up to four different events. When a capture pin is triggered, the contents of one of the timers are saved to a 4-level-deep FIFO. An example of using the event manager is a motor spindle that triggers the capture input on each revolution, where the 'C14 uses the captured timer data to determine the spindle speed and correct the speed by adjusting the PWM output from the compare system.