rs5c62 RICOH Co.,Ltd., rs5c62 Datasheet - Page 34

• Manufacturer Part Number: rs5c62
• Description: Real-time Clock
• Manufacturer: RICOH Co.,Ltd.

30
RP/RF/RS5C62
11.1-2 Initialization Subject to Setting of XSTP Bit
*
9
YES
Set 12-hour or 24-hour
time scale, time and
calendar counters,
interrupt cycles, and timer
output cycles
Control register 3
Control register 1
Interrupt cycle
selection register
Control register 2
Control register 1
Power-on from 0V
XSTP=0?
BSY=0?
Start
YES
NO
Fh
3h
0h
0h
Fh
*
*
*
*
*
*
NO
*
*
6
1
2
3
4
5
7
8
Wait
*
*
*
*
*
*
*
*
*
1)
2) Check the validity of internal time data.
3) Set both the TSTA and TSTB bits and the WTRST bit to “1” in the control
4)
5) Drive high (turn off) the INTR pin output.
6) Wait for the start of the crystal oscillators to confirm the start of oscillation
7) Set the XSTP bit to “0” in the control register 2.
8) Start both the clock and alarm functions.
9) This route is applied at start-up from the backup battery when the process
register 3 and thereby set the BSY bit to “1” in the control register 2.
indefinite states.
In using the XSTP bit, ensure error-free detection of the stop of oscilla-
tion by:
and TMR bit to “1” ( turn off the output pins) and the BANK bit to “1” in
the control register 1.
as well as the absence of a carry. Further, assign a time-out period to
exit from the loop for checking the BSY bit.
of initialization is omitted, assuming no internal time data destruction.
Set the WTEN bit to “0” (clock operation disabled), the ALEN bit to “0”
At power-on from 0V, the internal registers and the output pins have
1) Preventing the crystal oscillators causing condensation.
2) Preventing the VDD pin input from making instantaneous power dis-
3) Preventing the crystal oscillators from causing noises on the PCB (by
4) Preventing the individual pins from being impressed with voltage
connection.
such means as signal line isolation).
exceeding the maximum rating.