pcf8523u/12aa/1 NXP Semiconductors, pcf8523u/12aa/1 Datasheet - Page 12

• Manufacturer Part Number: pcf8523u/12aa/1
• Description: Pcf8523 Real-time Clock Rtc And Calendar
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8523
Product data sheet
Fig 7.
internal
reset signal
Software reset command
SDA
SCL
8.3 Reset
s
1
A reset is automatically generated at power-on. A reset can also be initiated with the
software reset command. Software reset command means setting bits 6, 4, and 3 in
register Control_1 (00h) logic 1 and all other bits logic 0 by sending the bit sequence
01011000 (58h), see
Table 8.
Bits labeled X are undefined at power-on and unchanged by subsequent resets. Bits labeled - are
not implemented.
Address Register name
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
1
slave address
0
1
Control_1
Control_2
Control_3
Seconds
Minutes
Hours
Days
Weekdays
Months
Years
Minute_alarm
Hour_alarm
Day_alarm
Weekday_alarm
Offset
Tmr_CLKOUT_ctrl
Tmr_A_freq_ctrl
Tmr_A_reg
Tmr_B_freq_ctrl
Tmr_B_reg
0
Register reset values
0
All information provided in this document is subject to legal disclaimers.
0
R/W
0
Figure
A
Rev. 2 — 27 January 2011
0
0
7.
address 00h
Bit
7
0
0
1
1
-
-
-
-
-
X
1
1
1
1
0
0
-
X
-
X
0
0
0
6
0
0
1
X
X
-
-
-
-
X
X
-
-
-
0
0
-
X
0
X
0
0
5
0
0
1
X
X
X
X
-
-
X
X
X
X
-
0
0
-
X
0
X
0
A
Real-Time Clock (RTC) and calendar
0
4
0
0
-
X
X
X
X
-
X
X
X
X
X
-
0
0
-
X
0
X
1
software reset 58h
0
3
0
0
0
X
X
X
X
-
X
X
X
X
X
-
0
0
-
X
-
X
1
1
0
2
0
0
0
X
X
X
X
X
X
X
X
X
X
X
0
0
1
X
1
X
0
PCF8523
© NXP B.V. 2011. All rights reserved.
0
013aaa320
1
0
0
0
X
X
X
X
X
X
X
X
X
X
X
0
0
1
X
1
X
A P/S
0
0
0
0
X
X
X
X
X
X
X
X
X
X
X
0
0
1
X
1
X
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