RV-4162 Datasheet, PDF (16/39 Pages) MICORO CRYSTAL SWITZERLAND – Ultra Small Real Time Clock

Micro Crystal
Ultra Small Real Time Clock / Calendar Module
RV-4162
4. DETAILED FUNCTIONAL DESCRIPTION
4.1. CLKOUT FREQUENCY SELECTION
The RV-4162 offers the user a programmable square wave clock which is available at CLKOUT pin 2. CLKOUT
frequency is programmable by bits FD3 - FD0 (bit 7 - 4 in register Day 04h) according to below table:
CLKOUT frequency selection (address 04h…FD3 - FD0 bits description)
Address
Function
Bit 7
Bit 6
Bit 5
Bit 4
04h
Day
FD3
FD2
FD1
FD0
Bit
Symbol
7 to 4
FD3 to FD0
Values
FD3
FD2
FD1
FD0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Bit 3
0
Bit 2
4
Bit 1
2
Bit 0
1
CLKOUT
Frequency
None
32.768
8.192
4.096
2.048
1.024
512
256
128
64
32
16
8
4
2
1
Units
-
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
CLKOUT pin 2 is push-pull output and can be disabled either by setting bits FD3 - FD0 = “0000” or by setting bit
CLKOE (bit 6 in register Month Alarm 0Ah) = “0”.
CLKOUT frequency enable / disable (address 0Ah…CLKOE bit description)
Address
Function
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3 Bit 2
0Ah
Month Alarm
AFE CLKOE
0
10
8
4
Bit
Symbol
6
CLKOE
Value
0
1
Description
Disables CLKOUT (clock output pin 2)
Enables CLKOUT (clock output pin 2)
Bit 1
2
Bit 0
1
Default setting at initial power-up is CLKOUT enabled with the frequency of 32.768 kHz. It is recommended to
disable CLKOUT when not used by the application to minimize current consumption of the device.
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