RV-8523 Datasheet, PDF (20/57 Pages) MICORO CRYSTAL SWITZERLAND – Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8523
8.7. RESET
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 others bits logic 0
by sending the bits sequence 01011000 (58h), see figure below.
After reset, the following mode is entered:
• 32.768 kHz CLKOUT active
• 24 hour mode is selected
• Register Frequency Offset is set logic 0
• No alarm set
• Timers disabled
• No interrupts enabled
• Battery switchover is disabled
• Battery low detection is disabled
8.7.1.REGISTER RESET VALUES
Address
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
Function
Control 1
Control 2
Control 3
Seconds
Minutes
Hours
Days
Weekdays
Months
Years
Minute Alarm
Hour Alarm
Day Alarm
Weekday Alarm
Frequency Offset
Timer & CLKOUT
Timer A Clock
Timer A
Timer B Clock
Timer B
Bit 7
0
0
1
1
X
X
X
X
X
-
1
1
1
1
0
0
X
-
X
-
Bit 6
0
0
1
-
-
X
X
X
X
-
-
X
X
X
0
0
X
-
0
-
Bit 5
0
0
1
-
-
-
-
X
X
-
-
-
-
X
0
0
X
-
0
-
Bit 4
0
0
X
-
-
-
-
X
-
-
-
-
-
X
0
0
X
-
0
-
Bit positions labeled as “-” are undefined at power-on and unchanged by subsequent resets.
Bit positions labeled as “X” are not implemented and will return 0 when read.
Bit 3
0
0
0
-
-
-
-
X
-
-
-
-
-
X
0
0
X
-
X
-
Bit 2
0
0
0
-
-
-
-
-
-
-
-
-
-
-
0
0
1
-
1
-
Bit 1
0
0
0
-
-
-
-
-
-
-
-
-
-
-
0
0
1
-
1
-
Bit 0
0
0
0
-
-
-
-
-
-
-
-
-
-
-
0
0
1
-
1
-
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