基于MCF51CN128设计的以太网连接参考方案

时间：08-11 来源：互联网点击：

data trace buffer with programmable start/stop conditions

Peripherals

C ADC―Up to 12 channel, 12-bit resolution; 2.5 μs conversion time; automatic compare function; 1.7 mV/°C temperature sensor; internal bandgap reference channel; operation in stop3; fully functional from 3.6 V to 1.8 V

C SCI―Three modules with optional 13-bit break

C SPI―Two interfaces with full-duplex or single-wire bi-directional; double-buffered transmit and receive; master or slave mode; MSB-first or LSB-first shifting

C IIC―Two IICs with up to 100 kbps with maxmimum bus loading; multi-master operation; programmable slave address; interrupt-driven byte-by-byte data transfer; supports broadcast mode and 11-bit addressing

C TPM―Two 3-channel, 16-bit resolution modules; selectable input capture, output compare, or buffered edge- or center-aligned PWM on each channel

C RTC―8-bit modulus counter with binary- or decimal-based prescaler; external clock source for precise time base, time-of-day, calendar- or task-scheduling functions; free-running on-chip low-power oscillator (1 kHz) for cyclic wake-up without external components; runs in all MCU modes

C MTIM―Two 8-bit resolution modulo timers with 8-bit prescaler

Input/Output

C Up to 70 general-purpose input/output (GPIO) pins, all with pin mux controls to select alternate functions

C 16 keyboard interrupt (KBI) pins with selectable polarity

C Hysteresis and configurable pull-up device or input filtering on all input pins; configurable slew rate and drive strength on all output pins 16 Rapid GPIO pins connected to the CPU’s high-speed local bus with set, clear, and toggle functionality (PTD and PTF)

MCF51CN128目标应用:

Building control

Industrial operator interfaces

Consumer and industrial appliances

Medical monitoring and instrumentation

Point-of-sale and courier systems

Security and building control systems

图1.MCF51CN128方框图

RDMCF51CN128: Serial to Ethernet Bridge

The most common use of this reference design will be to integrate old MCU projects to the internet. The connection between these legacy microcontrollers will be by SCI and SPI. The MCU used is the MCF51CN128. As a second goal, customers don’t need to know about ETH, or in certain cases, a little knowledge will be required, though enough information is provided for customer education in Lasko Ethernet TCP/IP implementation.