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参数资料
| 型号： | RX-4571LC |
| 厂商： | EPSON TOYOCOM CORP |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO12 |
| 封装： | ROHS COMPLIANT, VSOJ-12 |
| 文件页数： | 3/33页 |
| 文件大小： | 723K |
| 代理商： | RX-4571LC |
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RX
4571 LC
Page - 8
ETM18E-04
9.3. Restrictions on Access Operations During Power-on Initialization and Recovery from Backup
Many of this product's operations are linked to the internal quartz oscillator's clock signal, so normal operation is
not possible if there is no internal oscillation (= oscillation is stopped).
Therefore, we recommend that the initial setting to be set during power-on initialization or backup and restore
operations (i.e., when the power supply voltage is recovered after oscillation has stopped due to a voltage drop,
etc.) should be "first start internal oscillation, then wait for the oscillation stabilization time (see tSTA standard) to
elapse".
Note the following caution points concerning access operations during power-on initialization or when restoring
the power supply voltage from backup mode (hereafter referred to as "switching to the operating voltage").
1) Before switching to the operating voltage, read the VLF-bit (which indicates the RTC error status).
2) Initialization is required when the value read from the VLF-bit is "VLF = 1 (error status)".
Before initializing in response to this VLF = "1" result, we recommend first waiting for the internal oscillation
stabilization time (see the tSTA standard) to elapse.
Initialization is required when the status after reading a VLF-bit value of "1" is either of the following.
(Status 1) During power-on initialization
(Status 2) When the clock setting is invalid, such as due to a voltage drop during backup
Access timing during power-on initialization and when recovering the power supply voltage after a drop in the
voltage used to maintain the clock
VDD
Oscillation start voltage [v]
Internal oscillation
(illustration)
tSTA [ s ]
Oscillation start time
(internal oscillation wait time)
Normal access is enabled
Normal operation is enabled
Minimum voltage for clock maintenance VCLK ( Min. ) [ V ]
During power-on initialization or power supply
voltage recovery after drop in clock maintenance
voltage
30 [ ms ]
Note: After 30 (ms) has elapsed,
access is enabled. However,
operation is not guaranteed until
the internal oscillation has
become stabilized.
3) When the read VLF-bit value is "VLF = 0 (normal status)", access is enabled without waiting for stabilization of
oscillation.
Normal operation is enabled under the following two statuses when "0" is read as the VLF-bit value.
(Status 1) When correct operation is enabled (except for settings errors while in use)
(Status 2) When data is retained normally while switching to the operating voltage from backup mode
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| RX-4571SA | REAL TIME CLOCK, PDSO14 |
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相关代理商/技术参数 |
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| RX-4571NB | 制造商:EPSONTOYOCOM 制造商全称:Epson ToYoCom 功能描述:LOW BACKUP VOLTAGE SERIAL-INTERFACE REAL TIME CLOCK MODULE |
| RX-4571SA | 制造商:EPSONTOYOCOM 制造商全称:Epson ToYoCom 功能描述:LOW BACKUP VOLTAGE SERIAL-INTERFACE REAL TIME CLOCK MODULE |
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