Holtek HT45F23A Manual page 42

H i g h S p e e d
O s c i l l a t i o n
H X T
E R C
f
H I R C
E C
H i g h S p e e d O s c i l l a t i o n
C o n f i g u r a t i o n O p t i o n
L o w S p e e d
O s c i l l a t i o n
L I R C
f
L X T
L o w S p e e d O s c i l l a t i o n
C o n f i g u r a t i o n O p t i o n
Note: When the system clock source f
the power. Thus there is no f
Operation
Mode
NORMAL Mode
SLOW Mode
IDLE0 Mode
IDLE1 Mode
SLEEP0 Mode
SLEEP1 Mode
Rev. 1.40
TinyPower Flash MCU with OPA & Comparators
TM
H
6 - s t a g e P r e s c a l e r
f / 2
H
f / 4
H
f / 8
H
f / 1 6
H
f / 3 2
H
f / 6 4
H
L
System Clock Configurations
is switched to f from f
SYS L
~f /64 for peripheral circuit to use.
H H
CPU f
SYS
On f ~ f /64
H H
On f
L
Off Off
Off On
Off Off
Off Off
42
HT45F23A/HT45F24A
H L C L K ,
C K S 2 ~ C K S 0 b i t s
f
S U B
F a s t W a k e - u p f r o m S L E E P M o d e o r
I D L E M o d e C o n t r o l ( f o r H X T o n l y )
f
T B C
f
T B
f / 4
S Y S
T B C K
f
S U B
f
S
f / 4
S Y S
C o n f i g u r a t i o n O p t i o n
, the high speed oscillation will stop to conserve
H
Description
f f
SUB S
On On
On On
On On/Off
On On
Off Off
On On
f
S Y S
T i m e B a s e 0 / 1 ,
B u z z e r
W D T
f
TBC
On
On
On
On
Off
Off
March 29, 2019