PCF212311 Просмотр технического описания (PDF) - NXP Semiconductors.
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PCF212311 Datasheet PDF : 63 Pages
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NXP Semiconductors
PCF2123
SPI Real time clock/calendar
R/W
addr 00HEX
software reset 58HEX
b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0
0001000001011000
SCL
CE
internal
reset signal
(1) When CE is inactive, the interface is reset.
Fig 7. Software reset command
(1)
001aai562
After reset, the following mode is entered:
• 32.768 kHz on pin CLKOUT active
• 24 hour mode is selected
• Offset register is set to 0
• No alarms set
• Timer disabled
• No interrupts enabled
Table 6. Register reset values
Bits labeled as - are not implemented. Bits labeled as X are undefined at power-on and unchanged
by subsequent resets.
Address Register name Bit
7
6
5
4
3
2
1
0
00h
Control_1
0
0
0
0
0
0
0
0
01h
Control_2
0
0
0
0
0
0
0
0
02h
Seconds
1
X
X
X
X
X
X
X
03h
Minutes
-
X
X
X
X
X
X
X
04h
Hours
-
-
X
X
X
X
X
X
05h
Days
-
-
X
X
X
X
X
X
06h
Weekdays
-
-
-
-
-
X
X
X
07h
Months
-
-
-
X
X
X
X
X
08h
Years
X
X
X
X
X
X
X
X
09h
Minute_alarm
1
X
X
X
X
X
X
X
0Ah
Hour_alarm
1
-
X
X
X
X
X
X
0Bh
Day_alarm
1
-
X
X
X
X
X
X
0Ch
Weekday_alarm 1
-
-
-
-
X
X
X
0Dh
Offset_register
0
0
0
0
0
0
0
0
0Eh
Timer_clkout
-
0
0
0
0
-
1
1
0Fh
Countdown_timer X
X
X
X
X
X
X
X
PCF2123
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 April 2011
© NXP B.V. 2011. All rights reserved.
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