HT68F03 datasheet(35/139 Pages) HOLTEK

35 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

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

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 to

²1² or HLCLK bit

²0², but CKS2~CKS0 is set to ²010², ²011², ²100²,

²101², ²110² or ²111². As a 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 instruc-

tion 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 condi-

tions 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.

· The I/O ports will maintain their present conditions.

· In the status register, the Power Down flag, PDF, will

be set and the Watchdog time-out flag, TO, will be

cleared.

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