HT66F016 datasheet(41/116 Pages) HOLTEK

41 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

The maximum time out period is when the 2

18 division ra-

tio is selected. As an example, with a 32 kHz LIRC oscil-

lator as its source clock, this will give a maximum

watchdog period of around 8 second for the 2

18 division

ratio, and a minimum timeout of 7.8ms for the 2

8 division

ration.

· WDTC Register

Bit

76543210

Name

WE4

WE3

WE2

WE1

WE0

WS2

WS1

WS0

R/W

POR

01010011

Bit 7~3

WE4~WE0: WDT function software control

If the WDT configuration option is

²always enable²:

10101 or 01010: Enabled

Other: Reset MCU

If the WDT configuration option is

²controlled by the WDT control register²:

10101: Disabled

01010: Enabled

Other: Reset MCU

When these bits are changed by the environmental noise or software setting to reset the

microcontroller, the reset operation will be activated after 2~3 LIRC clock cycles and the WRF bit

in the CTRL register will be set to 1.

Bit 2~0

WS2, WS1, WS0: WDT time-out period selection

000: 2

8/f

001: 2

10/f

010: 2

12/f

011: 2

14/f

100: 2

15/f

101: 2

16/f

110: 2

17/f

111: 2

18/f

· CTRL Register

Bit

76543210

Name

FSYSON

¾¾¾¾

LVRF

LRF

WRF

R/W

¾¾¾¾

R/W

POR

¾¾¾¾

²x² unknown

Bit 7

FSYSON:fSYS Control in IDLE Mode

0: Disable

1: Enable

Bit 6~3

Unimplemented, read as

²0²

Bit 2

LVRF: LVR function reset flag

0: Not occur

1: Occurred

This bit is set to 1 when a specific Low Voltage Reset situation condition occurs. This bit can

only be cleared to 0 by the application program.

Bit 1

LRF: LVR Control register software reset flag

0: Not occur

1: Occurred

This bit is set to 1 if the LVRC register contains any non defined LVR voltage register values.

This in effect acts like a software reset function. This bit can only be cleared to 0 by the

application program.

Bit 0

WRF: WDT Control register software reset flag

0: Not occur

1: Occurred

This bit is set to 1 by the WDT Control register software reset and cleared by the application

program. Note that this bit can only be cleared to 0 by the application program.

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