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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： | 19/33页 |
| 文件大小： | 723K |
| 代理商： | RX-4571LC |
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RX
4571 LC
Page - 23
ETM18E-04
13.3. Alarm Interrupt Function
The alarm interrupt generation function generates interrupt events for alarm settings such as date, day, hour, and
minute settings.
When an interrupt event occurs, the AF bit value is set to "1" and the /IRQ pin goes to low level to indicate that
an event has occurred.
Example of
/IRQ operation
AIE = " 1 "
( AF = " 0 "
→ " 1 " )
AF = " 1 "
→ " 0 " or
AIE = " 1 "
→ " 0 "
13.3.1. Diagram of alarm interrupt function
AIE bit
/IRQ output
AF bit
Event
occurs
" 1 "
" 0 "
Hi - z
" L "
" 1 "
" 0 "
RTC internal operation
Write operation
(1)
(2)
(3)
(4)
" 1 "
(5)
(7)
(6)
(1) The hour, minute, date or day when an alarm interrupt event is to occur is set in advance along with the
WADA bit, and when the setting matches the current time an interrupt event occurs.
(Note) Even if the current date/time is used as the setting, the alarm will not occur until the counter counts up
to the current date/time (i.e., an alarm will occur next time, not immediately).
(2) When a time update interrupt event occurs, the AF bit values becomes "1".
(3) When the AF bit = "1", its value is retained until it is cleared to zero.
(4) If AIE = "1" when an alarm interrupt occurs, the /IRQ pin output goes low.
When an alarm interrupt event occurs, /IRQ pin output goes low, and this status is then held until it is
cleared via the AF bit or AIE bit.
(5) If the AIE value is changed from "1" to "0" while /IRQ is low, the /IRQ status immediately changes from low
to Hi-Z. After the alarm interrupt occurs and before the AF bit value is cleared to zero, the /IRQ status can be
controlled via the AIE bit.
(6) If the AF bit value is changed from "1" to "0" while /IRQ is low, the /IRQ status immediately changes from
low to Hi-Z.
(7) If the AIE bit value is "0" when an alarm interrupt occurs, the /IRQ pin status remains Hi-Z.
相关PDF资料 |
PDF描述 |
|---|---|
| RX-4571SA | REAL TIME CLOCK, PDSO14 |
| RX-4571SA | 0 TIMER(S), REAL TIME CLOCK, PDSO14 |
| RX-4574SG | 0 TIMER(S), REAL TIME CLOCK, PDSO16 |
| RX-4591CF | 0 TIMER(S), REAL TIME CLOCK, PDSO10 |
| RX-8025NB | 0 TIMER(S), REAL TIME CLOCK, PDSO22 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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