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HT95L00P 数据表(PDF) 18 Page - Holtek Semiconductor Inc |
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HT95L00P 数据表(HTML) 18 Page - Holtek Semiconductor Inc |
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18 / 52 page  HT95LXXX Rev. 1.20 18 May 26, 2004 Reset There are three ways in which a reset can occur. · Power on reset. · A low pulse onto RES pin. · WDT time-out. After these reset conditions, the Program Counter and Stack Pointer will be cleared to 0. To guarantee that the system oscillator is started and stabilized, the SST (System Start-up Timer) provides an extra-delay of 1024 system clock pulses when the sys- tem is reset or awakes from the Sleep or Idle operation mode. By examining the processor status flags PDF and TO, the software program can distinguish between the dif- ferent ²chip resets². TO PDF Reset Condition 0 0 Power on reset uu External reset during Normal mode or Green mode 01 External reset during Sleep mode or Idle mode 1u WDT time-out during Normal mode or Green mode 11 WDT time-out during Sleep mode or Idle mode Note: ²u² means ²unchanged² The functional units chip reset status are shown below: Program Counter 000H Interrupt Disabled Prescaler Cleared WDT Cleared After a master reset, WDT begins counting. (If WDT function is enabled by mask option) Timer/Event Counter 0/1 Off Input/output Port Input mode Stack Pointer Points to the top of the stack V D D R E S 1 0 0 k W 0 . 1 m F Reset Circuit W a r m R e s e t W D T C o l d R e s e t H A L T S Y S C L K S S T 1 0 - b i t R i p p l e C o u n t e r W D T t i m e - o u t E x t e r n a l R E S S y s t e m R e s e t Reset Configuration t S S T R E S V D D S S T T i m e - o u t C h i p R e s e t Reset Timing Chart When the reset conditions occurred, some registers may be changed or unchanged. (HT95L400/40P) Register Addr. Reset Conditions Power On RES Pin RES Pin (Sleep/Idle) WDT WDT (Sleep/Idle) IAR0 00H xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu MP0 01H xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu IAR1 02H xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu MP1 03H xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu BP 04H ---0 0000 ---0 0000 ---0 0000 ---0 0000 ---u uuuu ACC 05H xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu PCL 06H 0000H 0000H 0000H 0000H 0000H TBLP 07H xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu TBLH 08H xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu |
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