《移动信息工程导论》第9章LaunchPad简介.ppt

* * * * Introduction to LaunchPad MSP430 LaunchPad Development Kit LaunchPad development board Mini-USB cable, 10-pin PCB connectors 2 MSP430 MCUs: MSP430G2211, MSP430G2231 Micro Crystal 32.768kHz Oscillator MSP430 Microcontroller LaunchPad development kit uses microcontroller such as MSP430G2553 Microcontroller: A small computer on a single?IC?containing a processor core, memory, programmable I/O peripherals MSP430 microcontroller: Incorporates a 16-bit RISC CPU, peripherals, and a flexible clock system that are interconnected using a von-Neumann common memory address bus (MAB) and memory data bus (MDB) MSP430 Microcontroller MSP430G2553 outside view (pin-out): VCC , VSS : supply voltage and ground P1.0~P1.7, P2.0~P2.7 are for digital input and output, grouped into ports P1 and P2 TACLK, TA0, and TA1 are associated with Timer_A MSP430 Microcontroller MSP430G2553 outside view: (cont’d) A0~A9 are inputs to the analog-to-digital converter VREF is the reference voltage for the converter ACLK and SMCLK are outputs for the microcontroller’s clock signals SCLK, SDO, and SCL are used for the universal serial interface XIN and XOUT are the connections for a crystal RST is an active low reset signal NMI is the nonmaskable interrupt input MSP430G2553 Inside View MSP430 CPU RISC with 27 instructions and 7 addressing modes 16 16-bit registers with full register access including program counter, status registers, and stack pointer 16-bit address bus allows direct access and branching throughout entire memory range 16-bit data bus allows direct manipulation of word-wide arguments Constant generator provides six most used immediate values and reduces code size Direct memory-to-memory transfers without intermediate register holding Word and byte addressing and instruction formats MSP430 CPU Registers Sixteen 16-bit registers R0, R1, R2, and R3 have dedicated functions R4 to R15 are working registers for general use Memory Organization Little-endian ordering: The low-order byte i