HT45F43 datasheet(46/152 Pages) HOLTEK

46 / 152 page

The SLOW Mode is sourced from the LXT or the LIRC oscillators and therefore requires these

oscillators to be stable before full mode switching occurs. This is monitored using the LTO bit in the

SMOD register.

SLOW Mode to NORMAL Mode Switching

In SLOW Mode the system uses either the LXT or LIRC low speed system oscillator. To switch back

to the NORMAL Mode, where the high speed system oscillator is used, the HLCLK bit should be set

²1² or HLCLK bit is ²0², but CKS2~CKS0 is set to ²010², ²011², ²100², ²101², ²110² or ²111².Asa

certain amount of time will be required for the high frequency clock to stabilise, the status of the HTO

bit is checked. The amount of time required for high speed system oscillator stabilization depends

upon which high speed system oscillator type is used.

Entering the SLEEP0 Mode

There is only one way for the device to enter the SLEEP0 Mode and that is to execute the

²HALT²

instruction in the application program with the IDLEN bit in SMOD register equal to

²0² and the WDT

and LVD both off. When this instruction is executed under the conditions described above, the following

will occur:

· The system clock, WDT clock and Time Base clock will be stopped and the application program

will stop at the

²HALT² instruction.

· The Data Memory contents and registers will maintain their present condition.

· The WDT will be cleared and stopped no matter if the WDT clock source originates from the fSUB

clock or from the system clock.

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

N O R M A L M o d e

S L E E P 0 M o d e

S L E E P 1 M o d e

I D L E 0 M o d e

I D L E 1 M o d e

S L O W M o d e

C K S 2 ~ C K S 0 ¹ 0 0 0 B , 0 0 1 B a s H L C L K = 0

o r H L C L K = 1

W D T a n d L V D a r e a l l o f f

I D L E N = 0

H A L T i n s t r u c t i o n i s e x e c u t e d

W D T o r L V D i s o n

I D L E N = 0

H A L T i n s t r u c t i o n i s e x e c u t e d

I D L E N = 1 , F S Y S O N = 0

H A L T i n s t r u c t i o n i s e x e c u t e d

I D L E N = 1 , F S Y S O N = 1

H A L T i n s t r u c t i o n i s e x e c u t e d

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