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參數(shù)資料
| 型號： | RP5C62 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | REAL-TIME CLOCK |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP18 |
| 封裝： | DIP-18 |
| 文件頁數(shù)： | 34/48頁 |
| 文件大?。?/td> | 419K |
| 代理商： | RP5C62 |
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RP/RF/RS5C62
30
11.1-2 Initialization Subject to Setting of XSTP Bit
Start
Power-on from 0V
Interrupt cycle
selection register
Wait
YES
YES
NO
BSY=0
Set 12-hour or 24-hour
time scale, time and
calendar counters,
interrupt cycles, and timer
output cycles
Control register 3
Fh
Control register 1
3h
Control register 1
Fh
0h
*
2
*
1
*
3
*
4
*
5
Control register 2
0h
*
7
*
6
*
9
*
8
XSTP=0
NO
*
1) At power-on from 0V, the internal registers and the output pins have
indefinite states.
*
2) Check the validity of internal time data.
In using the XSTP bit, ensure error-free detection of the stop of oscilla-
tion by:
1) Preventing the crystal oscillators causing condensation.
2) Preventing the VDD pin input from making instantaneous power dis-
connection.
3) Preventing the crystal oscillators from causing noises on the PCB (by
such means as signal line isolation).
4) Preventing the individual pins from being impressed with voltage
exceeding the maximum rating.
*
3) Set both the TSTA and TSTB bits and the WTRST bit to “1” in the control
register 3 and thereby set the BSY bit to “1” in the control register 2.
*
4) Set the WTEN bit to “0” (clock operation disabled), the ALEN bit to “0”
and TMR bit to “1” ( turn off the output pins) and the BANK bit to “1” in
the control register 1.
*
5) Drive high (turn off) the INTR pin output.
*
6) Wait for the start of the crystal oscillators to confirm the start of oscillation
as well as the absence of a carry. Further, assign a time-out period to
exit from the loop for checking the BSY bit.
*
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
of initialization is omitted, assuming no internal time data destruction.
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