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PIC18F23K22 Datasheet(PDF) 56 Page - Microchip Technology |
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PIC18F23K22 Datasheet(HTML) 56 Page - Microchip Technology |
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56 / 492 page  PIC18(L)F2X/4XK22 DS41412B-page 56 Preliminary 2010 Microchip Technology Inc. 3.6 Selective Peripheral Module Control Idle mode allows users to substantially reduce power consumption by stopping the CPU clock. Even so, peripheral modules still remain clocked, and thus, con- sume power. There may be cases where the applica- tion needs what IDLE mode does not provide: the allocation of power resources to the CPU processing with minimal power consumption from the peripherals. PIC18(L)F2X/4XK22 family devices address this requirement by allowing peripheral modules to be selectively disabled, reducing or eliminating their power consumption. This can be done with control bits in the Peripheral Module Disable (PMD) registers. These bits generically named XXXMD are located in control registers PMD0, PMD1 or PMD2. Setting the PMD bit for a module disables all clock sources to that module, reducing its power consumption to an absolute minimum. In this state, the control and STATUS registers associated with the peripheral are also disabled, so writes to these registers have no effect and read values are invalid. REGISTER 3-1: PMD0: PERIPHERAL MODULE DISABLE REGISTER 0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 UART2MD UART1MD TMR6MD TMR5MD TMR4MD TMR3MD TMR2MD TMR1MD bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7 UART2MD: UART2 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power bit 6 UART1MD: UART1 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power bit 5 TMR6MD: Timer6 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power bit 4 TMR5MD: Timer5 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power bit 3 TMR4MD: Timer4 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power bit 2 TMR3MD: Timer3 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power bit 1 TMR2MD: Timer2 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power bit 0 TMR1MD: Timer1 Peripheral Module Disable Control bit 1 = Module is disabled, Clock Source is disconnected, module does not draw digital power 0 = Module is enabled, Clock Source is connected, module draws digital power |
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