HT45F43 datasheet(40/152 Pages) HOLTEK

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System Operation Modes

There are six different modes of operation for the microcontroller, each one with its own special

characteristics and which can be chosen according to the specific performance and power

requirements of the application. There are two modes allowing normal operation of the

microcontroller, the NORMAL Mode and SLOW Mode. The remaining four modes, the SLEEP0,

SLEEP1, IDLE0 and IDLE1 Mode are used when the microcontroller CPU is switched off to conserve

power.

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

T B C K

C o n f i g u r a t i o n O p t i o n

T i m e B a s e 0 / 1 ,

B u z z e r

W D T

L I R C

L X T

H i g h S p e e d

O s c i l l a t i o n

L o w S p e e d

O s c i l l a t i o n

f H

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

f H / 6 4

f H / 3 2

f H / 1 6

f H / 8

f H / 4

f H / 2

6 - s t a g e P r e s c a l e r

f L

f S U B

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

f S Y S

H L C L K ,

C K S 2 ~ C K S 0 b i t s

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 S Y S / 4

f T B

f S Y S / 4

f S U B

f S

H X T

E R C

E C

H I R C

System Clock Configurations

Note:

When the system clock source fSYS is switched to fL from fH, the high speed oscillation will stop to conserve the

power. Thus there is no fH~fH/64 for peripheral circuit to use.

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