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HT68F13 Datasheet(PDF) 45 Page - Holtek Semiconductor Inc |
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HT68F13 Datasheet(HTML) 45 Page - Holtek Semiconductor Inc |
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45 / 161 page  ResetInitialConditions The different types of reset described affect the reset flags in different ways. These flags, known as PDF and TO are located in the status register and are controlled by various microcontroller operations, such as the SLEEP or IDLE Mode function or Watchdog Timer. The reset flags are shown in the table: TO PDF RESETConditions 0 0 Power-onreset u u RES or LVR resetduringNORMALorSLOWModeoperation 1 u WDT time-out reset during NORMAL or SLOW Mode operation 1 1 WDT time-outresetduringIDLEorSLEEPModeoperation Note: ²u² stands for unchanged The following table indicates the way in which the various components of the microcontroller are af- fectedafterapower-onresetoccurs. Item ConditionAfterRESET ProgramCounter Resettozero Interrupts Allinterruptswillbedisabled WDT Clearafterreset, WDT beginscounting Timer/EventCounter TimerCounterwillbeturnedoff Input/OutputPorts I/Oportswillbesetupasinputs StackPointer StackPointerwillpointtothetopofthestack The different kinds of resets all affect the internal registers of the microcontroller in different ways. To ensure reliable continuation of normal program execution after a reset occurs, it is important to know what condition the microcontroller is in after a particular reset occurs. The following table de- scribeshoweachtypeofresetaffectseachofthe microcontroller internalregisters. HT68F13Register Register Reset (Power-on) RES or LVR Reset WDT Time-out (NormalOperation) WDT Time-out (IDLE) MP0 1xxxxxxx 1xxxxxxx 1xxxxxxx 1uuuuuuu MP1 1xxxxxxx 1xxxxxxx 1xxxxxxx 1uuuuuuu ACC xxxxxxxx uuuuuuuu uuuuuuuu uuuuuuuu PCL 000 00000 000 00000 000 00000 000 00000 TBLP xxxxxxxx uuuuuuuu uuuuuuuu uuuuuuuu TBHP - - - - - - xx - - - - - - uu - - - - - - uu - - - - - - uu TBLH - - xxxxxx - - uuuuuu - - uuuuuu - - uuuuuu STATUS - - 00xxxx - - uuuuuu - - 1uuuuu - - 11uuuu SMOD 00000011 00000011 00000011 uuuuuuuu LVDC - - 00 - 000 - - 00 - 000 - - 00 - 000 - - uu - uuu INTEG - - - - 0000 - - - - 0000 - - - - 0000 - - - - uuuu WDTC 01111010 01111010 01111010 uuuuuuuu TBC 0011 - - - - 0011 - - - - 0011 - - - - uuuu - - - - HT68F13/HT68F14/HT68F15 EnhancedI/OFlashType MCU Rev.1.10 45 February9,2011 |
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