PCF2127ATSLASH1 datasheet(37/80 Pages) NXP

tên linh kiện	PCF2127AT/1

Giải thích chi tiết về linh kiện	Integrated RTC, TCXO and quartz crystal

PDF	80 Pages

Scroll/Zoom	100%

nhà sản xuất	NXP [NXP Semiconductors]

Trang chủ	http://www.nxp.com

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37 / 80 page

PCF2127A_2

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Product data sheet

Rev. 02 — 7 May 2010

37 of 80

NXP Semiconductors

PCF2127A

Integrated RTC, TCXO and quartz crystal

Remark: WDTF is read only and cannot be cleared with the interface. WDTF can be

cleared by:

• loading a value in register Watchdg_tim_val

• reading of the register Control_2

Writing a logic 0 or logic 1 to WDTF has no effect.

• When the watchdog timer counter reaches 1, the watchdog timer flag WDTF is set

logic 1

• When a minute or second interrupt occurs, the minute/second flag MSF is set logic 1

(see Section 8.13.1)

Counter reached 1, WDTF is set logic 1, and an interrupt is generated.

Fig 21. WD_CD[1:0] = 10: watchdog activates an interrupt when timed out

Counter reached 1, WDTF is set logic 1, reset pulse on the RST pin is generated for a time equal

to tw(rst).

Fig 22. WD_CD[1:0] = 11: watchdog activates a reset pulse when timed out

001aag062

watchdog

timer value

WDTF

n = 1

MCU

INT

001aag063

watchdog

timer value

WDTF

tw(rst)

n = 1

MCU

RST

PCF2127AT/1 bảng dữ liệu(PDF) 37 Page - NXP Semiconductors