HT95L10P datasheet(13/42 Pages) HOLTEK

13 / 42 page

HT95L100/10P

Rev. 0.10

October 1, 2002

Preliminary

CLR WDT instruction will clear the WDT. In the case that

²CLR WDT1² and ²CLR WDT2² are chosen (i.e. Two

clear instructions), these two instructions must be exe-

cuted to clear the WDT; otherwise, the WDT may reset

the chip as a result of time-out.

Controller operation mode

Holtek

¢s telephone controllers support two system clock

and four operation modes. The system clock could be

32768Hz or 3.58MHz and operation mode could be Nor-

mal, Green, Sleep or Idle mode. These are all selected

by the software.

The following conditions will force the operation mode to

change to Green mode:

· Any reset condition from any operation mode

· Any interrupt from Sleep mode or Idle mode

· Port A wake-up from Sleep mode or Idle mode

How to change the Operation Mode

· Normal mode to Green mode:

Clear MODE1 to 0, then operation mode is changed to

Green mode but the UPEN status is not changed.

However, UPEN can be cleared by software.

· Normal mode or Green mode to Sleep mode:

Step 1: Clear MODE0 to 0

Step 2: Execute HALT instruction

After Step 2, operation mode is changed to Sleep

mode, the UPEN and MODE1 are cleared to 0 by

hardware.

· Normal mode or Green mode to Idle mode:

Step 1: Set MODE0 to 1

Step 2: Execute HALT instruction

After Step 2, operation mode is changed to Idle mode,

the UPEN and MODE1 are cleared to 0 by hardware.

· Green mode to Normal mode:

Step 1: Set UPEN to 1

Step 2: Software delay 20ms at least

Step 3: Set MODE1 to 1

After Step 3, operation mode is changed to Normal

mode.

· Sleep mode or Idle mode to Green mode:

Method 1: Any reset condition occurred

Method 2: Any interrupt is active

Method 3: Port A wake-up

Note: The Timer 0, Timer 1, RTC and dialer I/O inter-

rupt function will not work at the Idle mode be-

cause the 32768Hz crystal is stopped.

The reset conditions include power on reset, external re-

set, WDT time-out reset. By examining the processor

status flag, PD and TO, the program can distinguish be-

tween different

²reset conditions². Refer to the Reset

function for detailed description.

The port A wake-up and interrupt can be considered as

a continuation of normal execution. Each bit in port A

can be independently selected to wake-up the device by

mask option. Awakening from Port A stimulus, the pro-

gram will resume execution of the next instruction.

Any valid interrupts from Sleep mode or Idle mode may

cause two sequences. One is if the related interrupt is

disabled or the interrupt is enabled but the stack is full,

the program will resume execution at the next instruc-

tion. The other is if the interrupt is enabled and the stack

is not full, the regular interrupt response takes place. It is

necessary to mention that if an interrupt request flag is

set to

²1² before entering the Sleep mode or Idle mode,

the wake-up function of the related interrupt will be dis-

abled.

Label

Bits

R/W

Function

MODE

(26H)

4~0

Unused bit, read as

²0²

UPEN

1: Enable frequency up conversion function to generate 3.58MHz

0: Disable frequency up conversion function to generate 3.58MHz

MODE0

1: Disable 32768Hz oscillator while the HALT instruction is executed

(Idle mode)

0: Enable 32768Hz oscillator while the HALT instruction is executed

(Sleep mode)

MODE1

1: Select 3.58MHz as CPU system clock

0: Select 32768Hz as CPU system clock

Operation mode description

HALT

Instruction

MODE1

MODE0

UPEN

Operation

Mode

32768Hz

3.58MHz

System

Clock

Not execute

Normal

3.58MHz

Not execute

Green

OFF

32768Hz

Be executed

Sleep

OFF

HALT

Be executed

Idle

OFF

HALT

Note:

²X² means don¢t care

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