CHAPTER 13 STANDBY FUNCTIONUser’s Manual U16898EJ3V0UD23013.2 Standby Function Operation13.2.1 HALT mode(1) HALT modeThe HALT mode is set by executing the HALT instruction.The operating statuses in the HALT mode are shown below.Caution Because an interrupt request signal is used to clear the standby mode, if there is an interruptsource with the interrupt request flag set and the interrupt mask flag clear, the standby modeis immediately cleared if set.Table 13-2. Operating Statuses in HALT ModeLow-Speed Internal Oscillator Can Be StoppedNoteSetting of HALT ModeItemLow-Speed InternalOscillator Cannot BeStoppedNote When Low-Speed InternalOscillation ContinuesWhen Low-Speed InternalOscillation StopsSystem clock Clock supply to CPU is stopped.CPU Operation stops.Port (latch) Holds status before HALT mode was set.16-bit timer/event counter 00 Operable8-bit timer 80 OperableSets count clock to f XP to fXP/2 12 Operable8-bit timerH1 Sets count clock to f RL/2 7 Operable Operable Operation stops.System clock selected asoperating clockSetting prohibited Operation stops.Watchdogtimer“Low-speed internal oscillationclock” selected as operatingclockOperable (Operationcontinues.)Operation stops.A/D converter OperableSerial interface UART6 OperablePower-on-clear circuit Always operates.Low-voltage detector OperableExternal interrupt OperableNote “Cannot be stopped” or “Stopped by software” is selected for low-speed internal oscillator by the option byte(for the option byte, see CHAPTER 17 OPTION BYTE).
