HT95R34 datasheet(31/59 Pages) HOLTEK

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HT95R34

Rev. 1.10

February 18, 2009

HALT

Instruction

MODE1

MODE0

UPEN

Operation

Mode

32768Hz

3.58MHz

System

Clock

Not executed

Normal

3.58MHz

Not executed

Green

OFF

32768Hz

Executed

Sleep

OFF

Stopped

Executed

Idle

OFF

Stopped

Note:

²X² means don¢t care

MODE0 will be cleared to 0 automatically after wake-up from Idle Mode.

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

b 7

b 0

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

M O D E 1 M O D E 0 U P E N

F r e q u e n c y u p c o n v e r s i o n t o g e n e r a t e 3 . 5 8 M H z e n a b l e

1 : e n a b l e

0 : d i s a b l e

3 2 7 6 8 H z o s c i l l a t o r e n a b l e w h i l e t h e H A L T i n s t r u c t i o n i s e x e c u t e

1 : d i s a b l e 3 2 7 6 8 H z o s c i l l a t o r ( I d l e m o d e )

0 : e n a b l e 3 2 7 6 8 H z o s c i l l a t o r ( S l e e p m o d e )

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

1 : s e l e c t 3 . 5 8 M H z a s C P U c l o c k s y s t e m

0 : s e l e c t 3 2 7 6 8 H z a s C P U c l o c k s y s t e m

MODE Register

Operation Mode, Power-down and Wake-up

There are four operational modes, known as the idle mode, sleep mode, green mode, and normal mode. The chosen

mode is selected using the MODE0, MODE1 and UPEN bits in the MODE register but also depends upon whether the

HALT instruction has been executed or not.

Idle Mode

When the device enters this mode, the normal operating

current, will be reduced to an extremely low standby cur-

rent level. This occurs because when the device enters

the Power Down Mode, both the 3.58MHz and 32768Hz

system oscillators are stopped which reduces the power

consumption to extremely low levels, however, as the

device maintains its present internal condition, it can be

woken up at a later stage and continue running, without

requiring a full reset. This feature is extremely important

in application areas where the microcontroller must

have its power supply constantly maintained to keep the

device in a known condition but where the power supply

capacity is limited such as in battery applications.

Sleep Mode

In the Sleep Mode is similar to the mode, except here

the 32768Hz oscillator continues running after after the

HALT instruction has been executed. This feature en-

ables the device to continue with instruction execution

immediately after wake-up.

Green Mode

In the Green Mode, the 32768Hz oscillator is used as

the system clock for instruction execution. The following

conditions will force the microcontroller enter the Green

Mode:

· Any reset condition from any operational mode

· Any interrupt occurring during the Sleep Mode or Idle

mode

· A Port A Wake-up from the Sleep Mode or Idle Mode

Normal Mode

In the Normal mode the device uses the 3.58MHz gen-

erated by the frequency-up conversion circuit as the

system clock for instruction execution.

Changing the Operational Mode

Holtek

¢s telephone controllers support two system

clocks and four operational modes. The system clock

can be either 32768Hz or 3.58MHz and the operational

mode can be either Normal, Green, Sleep or Idle mode.

The operation mode is selected using software in the

following way:

· Normal mode to Green mode:

Clear bit MODE1 to 0, which will change the opera-

tional mode to the Green mode.

The UPEN bit status is not changed. However, the

UPEN bit can be cleared by software.

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