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MC13224VR2 데이터시트(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC13224VR2 데이터시트(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 50 page MC13224V Technical Data, Rev. 1.2 10 Freescale Semiconductor 2.6.2 Power Management The MC13224V power management is controlled through the Clock and Reset Module (CRM). The CRM is a dedicated module to handle MCU clock, reset, and power management functions which includes control of the power regulators. All these functions have impact on attaining lowest power. 2.6.2.1 CRM Features The CRM features include: • Control of system reset • Control clock gating for power savings • Sleep mode (Hibernate and Doze) management — Degree of chip power down — Retention of programmed parameters — Programmable retention of RAM contents — Clock management • Wake-up management — Graceful power-up — Clock management — Wake-up via programmable timer or external interrupts. • Wake-up timer — Hibernate mode - based on onboard 2 kHz oscillator or optional 32.768 kHz crystal oscillator — Doze mode - based on main reference oscillator, typically 24 MHz • Controls reference clocks based on default 24 MHz crystal oscillator or optional 13-26 MHz oscillator with PLL (external filter) for 24 MHz frequency synthesis. • MCU watchdog timer (COP) • Software initiated reset • Management control of onboard linear regulators and optional buck regulator 2.6.2.2 CRM Operation The CRM has primary control of the entire system: • Reset and power up — After release of the hardware RESETB signal, the CRM will perform a power up sequence of the MCU. The linear regulators and clock sources are managed for a graceful start-up of the MCU and its resources. The radio is not powered until needed • Normal operation of MCU — The clock management of the MCU and its resources are controlled by the CRM. The processor clock is programmable from low frequencies up to the maximum reference frequency (13-26 MHz optional w/24 MHz standard) to allow the application to trade-off processing speed versus power savings • Sleep modes and recovery — There are two sleep modes of Hibernate and Doze. The primary difference is that Doze mode keeps the reference oscillator running. Both modes can retain critical |
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