PCF8564A datasheet(29/65 Pages) NXP

部件名	PCF8564A

功能描述	Tiny Real-Time Clock/calendar with alarm function and I2C-bus

PDF	65 Pages

Scroll/Zoom	100%

制造商	NXP [NXP Semiconductors]

网页	http://www.nxp.com

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29 / 65 page

PCF85063A

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Product data sheet

Rev. 7 — 30 March 2018

29 of 65

NXP Semiconductors

PCF85063A

Tiny Real-Time Clock/calendar with alarm function and I2C-bus

8.6 Timer registers

The 8-bit countdown timer at address 10h is controlled by the register Timer_mode at

address 11h.

8.6.1 Register Timer_value

[1]

Default value.

[2]

Countdown period in seconds:

where T is the

countdown value.

(1) Only when all enabled alarm settings are matching.

It is only on increment to a matched case that the alarm flag is set.

Fig 16. Alarm function block diagram

Table 34.

Timer_value - timer value register (address 10h) bit description

Bit

Symbol

Value

Description

7to0

T[7:0]

0h[1] to

FFh

countdown timer value[2]

CountdownPeriod

SourceClockFrequency

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PCF8564A 数据表(PDF) 29 Page - NXP Semiconductors

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