参数资料
型号: RV5C387A-F
厂商: RICOH COMPANY LTD
元件分类: 时钟/数据恢复及定时提取
英文描述: 0 TIMER(S), REAL TIME CLOCK, PDSO10
封装: 4 X 2.90 MM, 1.20 MM HEIGHT, SSOP-10
文件页数: 7/49页
文件大小: 330K
代理商: RV5C387A-F
15
RV5C387A
2.2-4 XSTP
Oscillation Halt Sensing Bit
The XSTP bit is for sensing a halt in the oscillation of the crystal oscillator. The oscillation halt sensing circuit
operates only when the CE pin is “L”.
The XSTP bit will be set to 1 once a halt in the oscillation of the crystal oscillator is caused by such events as
power-on from 0 volts and a drop in supply voltage. The XSTP bit will hold the setting of 1 even after the restart of
oscillation. As such, the XSTP bit can be applied to judge the validity of clock and calendar data after power-on or
a drop in supply voltage.
When the XSTP bit is set to 1, all bits will be reset to 0 in the oscillation adjustment register, control register 1,
and control register 2, stopping the output from the INTRA, INTRB, INTRC pin and starting the output of 32.768-
kHz clock pulses from the 32KOUT pin.
The XSTP bit accepts only the writing of 0, which restarts the oscillation halt sensing circuit. Conversely, setting
the XSTP bit to 1 causes no event.
XSTP
Description
0
Sensing a normal condition of oscillation
1
Sensing a halt of oscillation
(Default setting)
CLEN1
Description
0
Enabling the 32-kHz clock output
1
Disabling the 32-kHz clock output
2.2-5 CLEN1
32-kHz Clock Output Bit 1
(Default setting)
Setting the CLEN1 bit or the CLEN2 bit (D4 in control register 1) to 0, specifies generating clock pulses with the
oscillation frequency of the 32.768-kHz crystal oscillator for output from the 32KOUT pin. Conversely, setting both
the CLEN1 bit and the CLEN2 bit to 1 specifies disabling (“L”) such output.
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