HT66F13 datasheet(33/173 Pages) HOLTEK

33 / 173 page

NORMALMode

As the name suggests this is one of the main operating modes where the microcontroller has all of its

functions operational and where the system clock is provided by one of the high speed oscillators. This

mode operates allowing the microcontroller to operate normally with a clock source will come from

one of the high speed oscillators, either the HXT, ERC or HIRC oscillators. The high speed oscillator

will however first be divided by a ratio ranging from 1 to 64, the actual ratio being selected by the

CKS2~CKS0 and HLCLK bits in the SMOD register. Although a high speed oscillator is used,

running the microcontroller at a divided clock ratio reduces the operating current.

SLOWMode

This is also a mode where the microcontroller operates normally although now with a slower speed

clock source. The clock source used will be from the low speed oscillator LIRC. Running the

microcontroller in this mode allows it to run with much lower operating currents. In the SLOW Mode,

the fH is off.

SLEEP0Mode

The SLEEP Mode is entered when an HALT instruction is executed and when the IDLEN bit in the

SMOD register is low. In the SLEEP0 mode the CPU will be stopped, and the fSUB and fS clocks will be

stopped too, and the Watchdog Timer function is disabled. In this mode, the LVDEN is must set to

²0².

If the LVDEN is set to

²1², it won¢t enter the SLEEP0 Mode.

SLEEP1Mode

The SLEEP Mode is entered when a HALT instruction is executed and the IDLEN bit in the SMOD

continue to operate if the LVDEN is set to

²1² or the Watchdog Timer function is enabled and if its

clock source is chosen via configuration option to come from the fSUB.

IDLE0Mode

The IDLE0 Mode is entered when a HALT instruction is executed and when the IDLEN bit in the

SMOD register is high and the FSYSON bit in the WDTC register is low. In the IDLE0 Mode the

system oscillator will be inhibited from driving the CPU but some peripheral functions will remain

operational such as the Watchdog Timer and TMs. In the IDLE0 Mode, the system oscillator will be

stopped. In the IDLE0 Mode the Watchdog Timer clock, fS, will either be on or off depending upon the

fS clock source. If the source is fSYS/4, then the fS clock will be off, and if the source comes from fSUB

then fS will be on.

IDLE1Mode

The IDLE1 Mode is entered when a HALT instruction is executed and when the IDLEN bit in the

SMOD register is high and the FSYSON bit in the WDTC register is high. In the IDLE1 Mode the

system oscillator will be inhibited from driving the CPU but may continue to provide a clock source to

keep some peripheral functions operational such as the Watchdog Timer and TMs. In the IDLE1

Mode, the system oscillator will continue to run, and this system oscillator may be high speed or low

speed system oscillator. In the IDLE1 Mode the Watchdog Timer clock, fS, will be on. If the source is

fSYS/4, then the fS clock will be on, and if the source comes from fSUB then fS will be on.

Rev.1.10

February9,2011

HT66F13/HT66F14/HT66F15

EnhancedA/DFlashType MCU

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