HT46R0664 datasheet(30/92 Pages) HOLTEK

30 / 92 page

Rev. 1.00

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD Type 8-Bit OTP MCU

Operating Modes

By using the LXT low frequency oscillator in combination with a high frequency oscillator, the

system can be selected to operate in a number of different modes. These modes are Normal, Slow,

Idle and Sleep.

Mode Types and Selection

The higher frequency oscillators provide higher performance but carry with it the disadvantage of

higher power requirements, while the opposite is of course true for the lower frequency oscillators.

With the capability of dynamically switching between fast and slow oscillators, the device has the

flexibility to optimise the performance/power ratio, a feature especially important in power sensitive

portable applications.

For the device the LXT oscillator can run together with any of the high speed oscillators, namely the

HXT, ERC or the HIRC. The CLKMOD bit in the CTRL0 register can be used to switch the system

clock from the selected high speed oscillator to the low speed LXT oscillator. When the HALT

instruction is executed the LXT oscillator can be chosen to run or not using the LXTEN bit in the

CTRL2 register.

HXT

ERC

HIRC

LXT

LIRC

fHXT

fERC

fHIRC

fLXT

fSYS

fLIRC

Configuration option

CLKMOD

(Normal or Slow Mode Select)

(Normal)

(SLOW)

MUX

To watchdog timer

MUX

System Clock Configurations

When the system enters the Sleep or Idle Mode, the high frequency system clock will always stop

running. The accompanying table shows the relationship between the CLKMOD bit, the HALT

instruction and the high/low frequency oscillators. The CLMOD bit can change Normal or Slow

Mode.

Operating Mode Control

Operating

Mode

OSC1/OSC2 Configuration

XT1/XT2 Configuration

HXT

ERC

HIRC

LXT

LXTEN=0

LXTEN=1

Normal

Slow

Off

Idle

Off

Sleep

Off

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