利用先進(jìn)的時(shí)鐘控制能力提高MCU設(shè)計(jì)的處理效率

　　MCUs擴(kuò)散到越來(lái)越多的權(quán)力約束的設(shè)計(jì)，加工效率成為提高系統(tǒng)設(shè)計(jì)的關(guān)注。以較少的功率獲得額外的處理能力的驅(qū)動(dòng)器不僅在電池供電產(chǎn)品中很重要，而且，越來(lái)越多的電源也被限制在許多“插件”模塊中，這些電源模塊的規(guī)格限制了電源。在這種情況下，一個(gè)高效的設(shè)計(jì)將能夠提供更多的功能，并創(chuàng)造一個(gè)較低的效率實(shí)現(xiàn)競(jìng)爭(zhēng)優(yōu)勢(shì)。

　　單片機(jī)設(shè)計(jì)的一個(gè)被忽視的方面是在時(shí)鐘控制區(qū)域。設(shè)計(jì)人員可以通過(guò)使用時(shí)鐘控制模塊的高級(jí)功能來(lái)調(diào)整CPU、外設(shè)和其他消耗資源的時(shí)鐘，從而創(chuàng)建更高效的設(shè)計(jì)。本文將探討先進(jìn)的時(shí)鐘控制模塊的一些常見(jiàn)功能的能力，并展示他們?nèi)绾问褂?，可以提高處理效率，在大多?shù)基于MCU的設(shè)計(jì)。

　　Clock sources

　　The overall operation of the MCU is managed by a clock-control block and many clock-control blocks have features that can be used to select， control， and manage the clock sources for the CPU， memory， peripherals， and analog blocks. By controlling the clocks to these blocks， and even turning off the clock for features not being used during certain processing routines， power can be applied to just the sections of the MCU that need it and just when they need it， making for a very efficient implementation. The starting point for clock management and control are the various clock sources available for use by the various sub-modules. Understanding the advantages and disadvantages of each clock source is the starting point for an efficient MCU implementation.