RV-4162 Datasheet, PDF (9/39 Pages) MICORO CRYSTAL SWITZERLAND – Ultra Small Real Time Clock

Micro Crystal
Ultra Small Real Time Clock / Calendar Module
3.2. BUFFER / TRANSFER REGISTERS
RV-4162
SCL
I²C
INTERFACE
SDA
3
1 ^Read
Clock Section 00h to 07h
10^th/100^th Second
Seconds
Minutes
Hours
Day
Date
Month / Century
Years
Control Section 08h to 0Fh
Freq. Compensation
Watchdog
...
Flags
Write ₂
32.768 kHz
OSCILLATOR
DIVIDE BY 32768
1 Hz
COUNTER
COUNTER
COUNTER
COUNTER
COUNTER
COUNTER
COUNTER
Clock Counters
“Clock Counter Registers” containing time & date information are accessed indirectly through transfer registers.
1
At start of Read command, data from “Clock Counter Registers” are copied into “Transfer Register” and
the present time & date is frozen. The I²C Interface reads the frozen data from Transfer Register, the
internal Clock Counter continuous to be updated by the 1 second ticks.
2
When Write to the “Clock Counter Registers”, data are written to the “Transfer Register” and internally
transferred to the “Clock Counter Registers” when address pointer increments to 08h or when STOP
condition from I²C Interface is received.
3 _{Non clock registers of the Control Section 08h to 0Fh are directly accessed from I2C Interface.}
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