HT66F13 datasheet(35/173 Pages) HOLTEK

35 / 173 page

Bit0

HLCLK:systemclockselection

0: f

H/2~ fH/64or fL

1: f

Thisbitisusedtoselectifthe f

H clockorthe fH/2~ fH/64or fL clockisusedasthesystemclock.

Whenthebitishighthe f

H clockwillbeselectedandiflowthe fH/2~ fH/64or fL clockwillbe

selected.Whensystemclockswitchesfromthe f

H clocktothe fL clock,the fH clockwillbe

automaticallyswitchedofftoconservepower.

FastWake-up

To minimise power consumption the device can enter the SLEEP or IDLE0 Mode, where the system

clock source to the device will be stopped. However when the device is woken up again, it can take a

considerable time for the original system oscillator to restart, stabilise and allow normal operation to

resume. To ensure the device is up and running as fast as possible a Fast Wake-up function is provided,

which allows fSUB, namely the LIRC oscillator, to act as a temporary clock to first drive the system until

the original system oscillator has stabilised. As the clock source for the Fast Wake-up function is fSUB,

the Fast Wake-up function is only available in the SLEEP1 and IDLE0 modes. When the device is

woken up from the SLEEP0 mode, the Fast Wake-up function has no effect because the fSUB clock is

stopped. The Fast Wake-up enable/disable function is controlled using the FSTEN bit in the SMOD

If the HXT oscillator is selected as the NORMAL Mode system clock and the Fast Wake-up function is

enabled, then it will take one to two tSUB clock cycles of the LIRC oscillator for the system to wake-up.

The system will then initially run under the fSUB clock source until 1024 HXT clock cycles have

elapsed, at which point the HTO flag will switch high and the system will switch over to operating

from the HXT oscillator.

If the ERC or HIRC oscillators or LIRC oscillator is used as the system oscillator then it will take

15~16 clock cycles of the ERC or HIRC or 1~2 cycles of the LIRC to wake up the system from the

SLEEP or IDLE0 Mode. The Fast Wake-up bit, FSTEN will have no effect in these cases.

System

Oscillator

FSTEN

Bit

Wake-upTime

(SLEEP0Mode)

Wake-upTime

(SLEEP1Mode)

Wake-upTime

(IDLE0Mode)

Wake-upTime

(IDLE1Mode)

HXT

1024 HXT cycles

1~2 HXT cycles

1024 HXT cycles

1~2 fSUB cycles

(Systemrunswith fSUB firstfor1024 HXT cycles

andthenswitchesovertorunwiththe HXT clock)

1~2 HXT cycles

ERC

15~16 ERC cycles

1~2 ERC cycles

HIRC

15~16 HIRC cycles

1~2 HIRC cycles

LIRC

1~2 LIRC cycles

²X² :don¢tcare

Wake-UpTimes

Note that if the Watchdog Timer is disabled, which means that the LIRC oscillator is off, then there will be no Fast

Wake-upfunctionavailablewhenthedevicewakes-upfromtheSLEEP0Mode.

Rev.1.10

February9,2011

HT66F13/HT66F14/HT66F15

EnhancedA/DFlashType MCU

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