M16C User Manual.pdf

Controlling Power ApplicationsMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERContinued from the previous pageCanceling protectb7b01Protect register [Address 000A16]PRCREnables writing to system clock control registers 0 and 1 (address 000616 and 000716)1 : write-enabledSwitching system clockb7b01 System clock control register 0 [Address 000616]CM0System clock select bit1 : XCIN-XCOUTStopping main clockb71b0System clock control register 0 [Address 000616]CM0Main clock (XIN-XOUT) stop bit1 : Off[F_WIT] = 1Interrupt enable flag (I flag) “1”WAIT instructionNOP instruction X 5=[F_WIT] : 1INT0 interrupt request generatedTB2 interrupt request generatedStarting main clock oscillatorb70b0System clock control register 0 [Address 000616]CM0Main clock (XIN-XOUT) stop bit0 : OnWait until the main clock has stabilizedSwitching system clockb70b0System clock control register 0 [Address 000616]CM0System clock select bit0 : XIN-XOUTFigure 3.8.3. Set-up procedure of controlling power using wait mode (2)482