HT66F13 datasheet(36/173 Pages) HOLTEK

36 / 173 page

OperatingModeSwitching

The device can switch between operating modes dynamically allowing the user to select the best

performance/power ratio for the present task in hand. In this way microcontroller operations that do

not require high performance can be executed using slower clocks thus requiring less operating current

and prolonging battery life in portable applications.

In simple terms, Mode Switching between the NORMAL Mode and SLOW Mode is executed using

the HLCLK bit and CKS2~CKS0 bits in the SMOD register while Mode Switching from the

NORMAL/SLOW Modes to the SLEEP/IDLE Modes is executed via the HALT instruction. When a

HALT instruction is executed, whether the device enters the IDLE Mode or the SLEEP Mode is

determined by the condition of the IDLEN bit in the SMOD register and FSYSON in the WDTC

When the HLCLK bit switches to a low level, which implies that clock source is switched from the

high speed clock source, fH, to the clock source, fH/2~fH/64 or fL. If the clock is from the fL, the high

speed clock source will stop running to conserve power. When this happens it must be noted that the

fH/16 and fH/64 internal clock sources will also stop running, which may affect the operation of other

internal functions such as the TMs. The accompanying flowchart shows what happens when the

device moves between the various operating modes.

HT66F13/HT66F14/HT66F15

EnhancedA/DFlashType MCU

Rev.1.10

February9,2011

S L E E P 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

f S Y S o f f

C P U s t o p

I D L E N = 0

f T B C o f f

f S U B o f f

W D T & L V D o f f

N O R M A L

f S Y S = f H ~ f H / 6 4

f H o n

C P U r u n

f S Y S o n

f T B C o n

f S U B o n

I D L E 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

C P U s t o p

I D L E N = 1

F S Y S O N = 1

f S Y S o n

f T B C o n

f S U B o n

I D L E 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

C P U s t o p

I D L E N = 1

F S Y S O N = 0

f S Y S o f f

f T B C o n

f S U B o n

S L O W

f S Y S = f L

f L o n

C P U r u n

f S Y S o n

f T B C o n

f S U B o n

f H o f f

S L E E P 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

f S Y S o f f

C P U s t o p

I D L E N = 0

f T B C o f f

f S U B o n

W D T o r L V D o n

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