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PCF8563 데이터시트(PDF) 18 Page - NXP Semiconductors

부품명 PCF8563
상세설명  Real-time clock/calendar
PDF  50 Pages
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제조업체  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
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PCF8563 데이터시트(HTML) 18 Page - NXP Semiconductors

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PCF8563
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© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 10 — 3 April 2012
18 of 50
NXP Semiconductors
PCF8563
Real-time clock/calendar
8.8.2 Register Timer
The register Timer is an 8-bit binary countdown timer. It is enabled and disabled via the
Timer_control register bit TE. The source clock for the timer is also selected by the
Timer_control register. Other timer properties such as interrupt generation are controlled
via the register Control_status_2.
For accurate read back of the count down value, it is recommended to read the register
twice and check for consistent results, since it is not possible to freeze the countdown
timer counter during read back.
Table 24.
Timer - timer value register (address 0Fh) bit description
Bit
Symbol
Value
Description
7 to 0
TIMER[7:0]
00h to FFh
countdown period in seconds:
where n is the countdown value
Table 25.
Timer register bits value range
Bit
7
6
5
4
3
2
1
0
128
64
32
16
8421
CountdownPeriod
n
SourceClockFrequency
---------------------------------------------------------------
=



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