Holtek HT45F23A Manual page 48

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 "1" or HLCLK bit is "0", but CKS2~CKS0 is set to "010", "011", "100", "101", "110"
or "111". 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.
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
Rev. 1.40
TinyPower Flash MCU with OPA & Comparators
TM
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
S L E E P 1 M o d e
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 0 M o d e
I D L E 1 M o d e
48
HT45F23A/HT45F24A
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
N O R M A L M o d e
S L E E P 0 M o d e
March 29, 2019