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LM3S8730-IGZ25-A2T 데이터시트(PDF) 35 Page - Texas Instruments |
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LM3S8730-IGZ25-A2T 데이터시트(HTML) 35 Page - Texas Instruments |
35 / 551 page 1.4.2.1 PWM Pulse width modulation (PWM) is a powerful technique for digitally encoding analog signal levels. High-resolution counters are used to generate a square wave, and the duty cycle of the square wave is modulated to encode an analog signal. Typical applications include switching power supplies and motor control. On the LM3S8730, PWM motion control functionality can be achieved through: ■ The motion control features of the general-purpose timers using the CCP pins CCP Pins (see page 217) The General-Purpose Timer Module's CCP (Capture Compare PWM) pins are software programmable to support a simple PWM mode with a software-programmable output inversion of the PWM signal. 1.4.3 Serial Communications Peripherals The LM3S8730 controller supports both asynchronous and synchronous serial communications with: ■ Two fully programmable 16C550-type UARTs ■ One SSI module ■ One I2C module ■ One CAN unit ■ Ethernet controller 1.4.3.1 UART (see page 271) A Universal Asynchronous Receiver/Transmitter (UART) is an integrated circuit used for RS-232C serial communications, containing a transmitter (parallel-to-serial converter) and a receiver (serial-to-parallel converter), each clocked separately. The LM3S8730 controller includes two fully programmable 16C550-type UARTs that support data transfer speeds up to 3.125 Mbps. (Although similar in functionality to a 16C550 UART, it is not register-compatible.) In addition, each UART is capable of supporting IrDA. Separate 16x8 transmit (TX) and receive (RX) FIFOs reduce CPU interrupt service loading. The UART can generate individually masked interrupts from the RX, TX, modem status, and error conditions. The module provides a single combined interrupt when any of the interrupts are asserted and are unmasked. 1.4.3.2 SSI (see page 312) Synchronous Serial Interface (SSI) is a four-wire bi-directional full and low-speed communications interface. The LM3S8730 controller includes one SSI module that provides the functionality for synchronous serial communications with peripheral devices, and can be configured to use the Freescale SPI, MICROWIRE, or TI synchronous serial interface frame formats. The size of the data frame is also configurable, and can be set between 4 and 16 bits, inclusive. The SSI module performs serial-to-parallel conversion on data received from a peripheral device, and parallel-to-serial conversion on data transmitted to a peripheral device. The TX and RX paths are buffered with internal FIFOs, allowing up to eight 16-bit values to be stored independently. 35 June 22, 2010 Texas Instruments-Production Data Stellaris® LM3S8730 Microcontroller |
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