By Chris Nagy
Find out about designing, programming, and constructing with the preferred new Texas tools family members of microcontrollers, the MSP430 sequence with this new ebook from Chris Nagy. This product line is experiencing explosive progress because of its low-power intake and robust beneficial properties, yet little or no layout and alertness info is out there except what's provided by way of the producer. The ebook fills a niche within the technical literature for embedded structures engineers via supplying a extra whole blend of technical info, instance code, and descriptive prose than is on the market from the producer reference details, and comes in handy to either pros and hobbyists. meant for embedded engineers who're new to the embedded box, or for the millions of engineers who've adventure with different microcontrollers (such as photographs, 8051s, or Motorola HC0x units) yet are new to the MSP430 line, Chris Nagy bargains an intensive and useful description of the gadget positive factors, supplies improvement directions, and offers layout examples. Code examples are utilized in almost each bankruptcy and zone additionally integrated at the better half CD-ROM, and/or on-line. The booklet is split into 3 sections: the 1st part presents distinct descriptions of the units themselves; the second one describes hardware/firmware improvement for the units; the 3rd is designed to include details from the 1st , and supply guidance and examples of designs. * Get up-to-speed at the TI MSP430 product family's positive factors and idiosyncrasies * A 'hand-holding' connection with support start on designs * Accompanying CD-ROM comprises code examples
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Extra resources for Embedded Systems Design Using the TI MSP430 Series
5: ’1xx Series Digitally Controlled Oscillator ■ ’3xx Series DCO The ’3xx series DCO is an internally controlled oscillator, which generates a signal identified as MCLK. MCLK is a function of ACLK, which is generated by the crystal oscillator. The relationship is MCLK = (N+1)ACLK, where N is the multiplier defined by the 7 LSBs of the register SCFQCTL. On reset, N is initialized to a value of 31. The ’3xx series uses the same N,N+1 frequency modulation scheme as ’1xx devices, with the modulation bits located in the SCFI1 and SCFI0 registers.
24 3 CHAPTER Reset and Interrupts The ’430 offers numerous interrupt sources, both external and internal. Interrupts are prioritized, with the reset interrupt having the highest priority. This chapter covers the reset sources and conditions in detail, and describes the MSP430 interrupt functionality. Reset Sources The ’430 uses two separate reset signals, one for hardware and one for software. The hardware reset, which is identified in the literature as POR (power on reset), is generated on initial powerup and when the reset line (RST/NMI) is pulled low.
The fDCO and fDCO+1 frequencies are distributed roughly equally through the cycle of 32 clocks, which helps this inaccuracy slightly, but this is something the developer needs to be wary of. g. g. 16 steps at each frequency). The solution I have used to handle this inaccuracy is simple: use a crystal to meet short period precision timing requirements. Both the DCO and crystals suffer from error due to aging and temperature. I have found that crystal inaccuracies are usually more predictable than those introduced by the DCO, since they do not add the unpredictability of guessing where in the fDCO/fDCO+1 cycle the timing process began.