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        EEPW首頁(yè) > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > Freescale MC56F8257數(shù)字信號(hào)控制器開(kāi)發(fā)方案

        Freescale MC56F8257數(shù)字信號(hào)控制器開(kāi)發(fā)方案

        作者: 時(shí)間:2012-10-22 來(lái)源:網(wǎng)絡(luò) 收藏

        – Additional conversion time of 6-ADC clock cycles (6 x 100 ns = 600 ns)

        — Sequential, parallel, and independent scan mode

        — First 8 samples have Offset, Limit and Zero-crossing calculation supported

        — ADC conversions can be synchronized by eFlexPWM and timer modules via internal crossbar module

        — Support for simultaneous and software triggering conversions

        — Support for multi-triggering mode with a programmable number of conversions on each trigger

        • Inter-module Crossbar Switch (XBAR)

        — Programmable internal module connections among the eFlexPWM, ADCs, Quad Timers, 12-bit DAC, HSCMPs, and package pins

        — User-defined input/output pins for PWM fault inputs, Timer input/output, ADC triggers, and Comparator outputs

        • Three analog comparators (CMPs)

        — Selectable input source includes external pins, internal DACs

        Programmable output polarity

        — Output can drive timer input, eFlexPWM fault input, eFlexPWM source, external pin output, and trigger ADCs

        — Output falling and rising edge detection able to generate interrupts

        — 32-tap programmable voltage reference per comparator

        • One 12-bit digital-to-analog converter (12-bit DAC)

        — 12-bit resolution

        — Power down mode

        — Output can be routed to internal comparator, or off chip

        • Two four-channel 16-bit multi-purpose timer (TMR) modules

        — Four independent 16-bit counter/timers with cascading capability per module

        — Up to 120 MHz operating clock

        — Each timer has capture and compare and quadrature decoder capability

        — Up to 12 operating modes

        — Four external inputs and two external outputs

        • Two queued serial communication interface (QSCI) modules with LIN slave functionality

        — Up to 120 MHz operating clock

        — Four-byte-deep FIFOs available on both transmit and receive buffers

        — Full-duplex or single-wire operation

        — Programmable 8- or 9-bit data format

        — 13-bit integer and 3-bit fractional baud rate selection

        — Two receiver wakeup methods:

        – Idle line

        – Address mark

        — 1/16 bit-time noise detection

        — Support LIN slave operation

        • One queued serial peripheral interface (QSPI) module

        — Full-duplex operation

        — Four-word deep FIFOs available on both transmit and receive buffers

        — Master and slave modes

        — Programmable length transactions (2 to 16 bits)

        Programmable transmit and receive shift order (MSB as first or last bit transmitted)

        — Maximum slave module frequency = module clock frequency/2

        — 13-bit baud rate divider for low speed communication

        • Two inter-integrated circuit (I2C) ports

        — Operation at up to 100 kbps

        — Support for master and slave operation

        — Support for 10-bit address mode and broadcasting mode

        — Support for SMBus, Version 2

        • One Scalable Controller Area Network (MSCAN) module

        — Fully compliant with CAN protocol Version 2.0 A/B

        — Support for standard and extended data frames

        — Support for data rate up to 1 Mbit/s

        — Five receive buffers and three transmit buffers

        • Computer operating properly (COP) watchdog timer capable of selecting different clock sources

        — Programmable prescaler and timeout period

        — Programmable wait, stop, and partial powerdown mode operation

        — Causes loss of reference reset 128 cycles after loss of reference clock to the PLL is detected

        — Choice of clock sources from four sources in support of EN60730 and IEC61508:

        – On-chip relaxation oscillator

        – External crystal oscillator/external clock source

        – System clock (IP bus to 60 MHz)

        • Power supervisor (PS)

        — On-chip linear regulator for digital and analog circuitry to lower cost and reduce noise

        — Integrated low voltage detection to generate warning interrupt if VDD is below low voltage detection (LVI) threshold

        — Integrated power-on reset (POR)

        – Reliable reset process during power-on procedure

        – POR is released after VDD passes low voltage detection (LVI) threshold

        — Integrated brown-out reset

        Run, wait, and stop modes

        • Phase lock loop (PLL) providing a high-speed clock to the core and peripherals

        — 2x system clock provided to Quad Timers and SCIs

        — Loss of lock interrupt

        — Loss of reference clock interrupt



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