ST20P18 datasheet(7/12 Pages) SITRONIX

Nome de Peças	ST20P18

Descrição Electrónicos	16K 8-bit Single Chip Microcontroller

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Fabricante Electrônico	SITRONIX [Sitronix Technology Co., Ltd.]

Página de início	http://www.sitronix.com.tw

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7 / 12 page

ST20P18

Ver 1.4

7/12

6/13/07

TABLE 6-2: Option ward

TABLE 6-3: OTP option ward read back window

7

7.. P

Po

ow

we

err O

On

n T

Tiim

me

err

The Power-on Timer (PWRT) is offered necessary delays

on power-up to keep the chip in reset until the crystal

oscillator is stable, the typical delay time in 3v at 25℃ is

32ms, and operation in voltage 2.4V~5.5V ,60℃~ -10℃ is

4~640ms. The default state is high with one internal

pull-up resistance.

TABLE 7-4: Power on timer pin option

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

CP

-

WDTSTP

WDTEN

-

PD

1--- 11-1

Bit 7: CP: OTP ROM code protect.

0 =protect OTP data.

1 =Un-Protect OTP data.

Bit 3: WDTSTP: WDT stop control bit.

0 = WDT stop at WAI-1 and STP mode.

1 = WDT is always active if WDTEN is enabled.

Bit 2: WDTEN: WDT enable.

0 = WDT disable.

1 = WDT enable.

Bit 0: PD: Port function selection

0 = PD used as input port.

1 = OSC input pin for 32768Hz crystal.

Address

Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

$037

OPT

R

CP

-

PWRT

WDTSTP WDTEN

-

PD

1--1 11-1

IC pad

option

Description

Default

0

disable power-on timer, tie to GND

PWRT

1

enable power-on timer, tie to VCC

1:input pull-up

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