HT46R92 datasheet(32/61 Pages) HOLTEK

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HT46R92

Rev. 1.10

November 5, 2008

M O D E R e g i s t e r

S y s t e m C l o c k S e l e c t

1 : 3 2 7 6 8 H z s y s t e m c l o c k

0 : R C / C r y s t a l s y s t e m c l o c k

N o t i m p l e m e n t e d , r e a d a s " 0 "

3 2 7 6 8 H z O s c i l l a t o r Q u i c k S t a r t

1 : s l o w s t a r t

0 : q u i c k s t a r t

N o t i m p l e m e n t e d , r e a d a s " 0 "

b 0

M O D S

b 7

Q O S C

Operation Mode Register

¾ MODE

Operation Mode

The device can operate in three different modes which

are known as Normal, Slow and Power Down. To sup-

port these different modes two system clocks are re-

quired, an RC or Crystal external system oscillator

connected to the OSC1 and OSC2 pins and and a

32768 external Crystal oscillator connected to the

OSC3 and OSC4 pins. Both system clocks must be con-

nected for correct operation.

Mode Selection

The choice of which system clock is used is made using

the MODS bit in the MODE register and can be either an

RC/XTAL oscillator or a 32768Hz RTC. Selecting the

slower 32768Hz oscillator by setting the MODS bit high

will naturally cause the microcontroller to consume less

power; this is known as the Slow Mode. In this mode the

RC or Crystal oscillator will be turned off. Selecting the

higher frequency RC or Crystal oscillator by setting the

MODS bit to zero will place the microcontroller in the

Normal Mode. The other mode, known as the

Power-down Mode can only be entered when a HALT

instruction is executed. Note that in all modes the

32768Hz oscillator continues to run.

If the 32768Hz oscillator is chosen as the system clock,

then the WDT clock source configuration option must

also select the 32768Hz oscillator as its clock source,

otherwise unpredictable system operation may occur.

Mode

System Clock

HALT Instruction

MODS

RC/XTAL Oscillator

32768Hz

Normal

RC/XTAL oscillator

Not Executed

Slow

32768Hz

Not Executed

Off

Power Down

HALT

Executed

Off

Operation Mode

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