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PIC18F2525 Datasheet(PDF) 35 Page - Microchip Technology |
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PIC18F2525 Datasheet(HTML) 35 Page - Microchip Technology |
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35 / 412 page  © 2008 Microchip Technology Inc. DS39626E-page 33 PIC18F2525/2620/4525/4620 3.0 POWER-MANAGED MODES PIC18F2525/2620/4525/4620 devices offer a total of seven operating modes for more efficient power management. These modes provide a variety of options for selective power conservation in applications where resources may be limited (i.e., battery-powered devices). There are three categories of power-managed modes: • Run modes • Idle modes • Sleep mode These categories define which portions of the device are clocked and sometimes, what speed. The Run and Idle modes may use any of the three available clock sources (primary, secondary or internal oscillator block); the Sleep mode does not use a clock source. The power-managed modes include several power- saving features offered on previous PIC® devices. One is the clock switching feature, offered in other PIC18 devices, allowing the controller to use the Timer1 oscil- lator in place of the primary oscillator. Also included is the Sleep mode, offered by all PIC devices, where all device clocks are stopped. 3.1 Selecting Power-Managed Modes Selecting a power-managed mode requires two decisions: if the CPU is to be clocked or not and the selection of a clock source. The IDLEN bit (OSCCON<7>) controls CPU clocking, while the SCS1:SCS0 bits (OSCCON<1:0>) select the clock source. The individual modes, bit settings, clock sources and affected modules are summarized in Table 3-1. 3.1.1 CLOCK SOURCES The SCS1:SCS0 bits allow the selection of one of three clock sources for power-managed modes. They are: • the primary clock, as defined by the FOSC3:FOSC0 Configuration bits • the secondary clock (the Timer1 oscillator) • the internal oscillator block (for RC modes) 3.1.2 ENTERING POWER-MANAGED MODES Switching from one power-managed mode to another begins by loading the OSCCON register. The SCS1:SCS0 bits select the clock source and determine which Run or Idle mode is to be used. Changing these bits causes an immediate switch to the new clock source, assuming that it is running. The switch may also be subject to clock transition delays. These are discussed in Section 3.1.3 “Clock Transitions and Status Indicators” and subsequent sections. Entry to the power-managed Idle or Sleep modes is triggered by the execution of a SLEEP instruction. The actual mode that results depends on the status of the IDLEN bit. Depending on the current mode and the mode being switched to, a change to a power-managed mode does not always require setting all of these bits. Many transitions may be done by changing the oscillator select bits, or changing the IDLEN bit, prior to issuing a SLEEP instruction. If the IDLEN bit is already configured correctly, it may only be necessary to perform a SLEEP instruction to switch to the desired mode. TABLE 3-1: POWER-MANAGED MODES Mode OSCCON Bits<7,1:0> Module Clocking Available Clock and Oscillator Source IDLEN(1) SCS1:SCS0 CPU Peripherals Sleep 0 N/A Off Off None – All clocks are disabled PRI_RUN N/A 00 Clocked Clocked Primary – LP, XT, HS, HSPLL, RC, EC and Internal Oscillator Block(2). This is the normal full-power execution mode. SEC_RUN N/A 01 Clocked Clocked Secondary – Timer1 Oscillator RC_RUN N/A 1x Clocked Clocked Internal Oscillator Block(2) PRI_IDLE 100 Off Clocked Primary – LP, XT, HS, HSPLL, RC, EC SEC_IDLE 101 Off Clocked Secondary – Timer1 Oscillator RC_IDLE 11x Off Clocked Internal Oscillator Block(2) Note 1: IDLEN reflects its value when the SLEEP instruction is executed. 2: Includes INTOSC and INTOSC postscaler, as well as the INTRC source. |
Similar Part No. - PIC18F2525_08 |
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Similar Description - PIC18F2525_08 |
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