RX - 8581 SA / JE / NB
3) AF (Alarm Flag) bitWhen this flag bit value is already set to "0", occurrence of an alarm interrupt event changes it to "1". When this flag bit value is "1", its value is retained until a "0" is written to it.
AF | Data | Description | |
| 0 | The AF bit is cleared to zero to prepare for the next status detection | |
Write | ∗ Clearing this bit to zero enables /INT low output to be canceled (/INT remains | ||
| interrupt event has occurred. | ||
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| 1 | This bit is invalid after a "1" has been written to it. | |
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| 0 | Alarm interrupt events are not detected. | |
Read |
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1 | Alarm interrupt events are detected. | ||
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| (Result is retained until this bit is cleared to zero.) | ||
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When an alarm interrupt event occurs (when the AF bit value changes from "0" to "1"), this bit's value specifies whether an interrupt signal is generated (/INT status changes from
AIE | Data | Description |
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| 1) When an alarm interrupt event occurs, an interrupt signal is not |
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| 0 | 2) When an alarm interrupt event occurs, the interrupt signal is canceled |
| (/INT status changes from low to | |
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| ∗ Even when the AIE bit value is "0" another interrupt event may change the /INT status to low |
| (or may hold /INT = "L"). | |
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| When an alarm interrupt event occurs, an interrupt signal is generated (/INT |
| 1 | status changes from |
| ∗ When an alarm interrupt event occurs, | |
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| AIE bit value is "1". This value is retained (not automatically cleared) until the AF bit is cleared |
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| to zero. |
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| Day is specified |
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| Reg – A |
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| Reg - 9 | Reg - 8 | ||
bit | bit | bit | bit | bit | bit | bit | bit | HOUR | MIN | ||||
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| WADA bit = "0" | 7 | 6 |
| 5 | 4 | 3 | 2 | 1 |
| 0 | |||
AE | S F T | W T M S | Alarm | Alarm | |||||||||
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| Monday through Friday, at 7:00 AM | 0 | 0 |
| 1 | 1 | 1 | 1 | 1 |
| 0 | 07 h | 80 h ∼ FF h | |
| ∗ Minute value is ignored |
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| Every Saturday and Sunday, for 30 minutes | 0 1 | 0 | 0 | 0 | 0 | 0 | 1 | 80 h ∼ FF h | 30 h | ||||
| each hour ∗ Hour value is ignored | |||||||||||||
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| Every day, at 6:59 AM | 0 | 1 |
| 1 | 1 | 1 | 1 | 1 |
| 1 | 18 h | 59 h | |
1 | Χ |
| Χ | Χ | Χ | Χ | Χ |
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Day is specified |
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| Reg - A |
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| Reg - 9 | Reg - 8 | ||
bit | bit | bit | bit | bit | bit | bit | bit | HOUR | MIN | |||
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| WADA bit = "1" | 7 | 6 |
| 5 | 4 | 3 | 2 | 1 | 0 | |||
AE | • |
| 20 10 | 08 04 02 01 | Alarm | Alarm | ||||||
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| First of each month, at 7:00 AM | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 1 | 07 h | 80 h ∼ FF h | |
∗ Minute value is ignored |
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| 15th of each month, for 30 minutes each | 0 0 | 0 | 1 | 0 | 1 | 0 | 1 | 80 h ∼ FF h | 30 h | |||
| hour ∗ Hour value is ignored | ||||||||||||
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| Every day, at 6:59 PM | 1 | Χ |
| Χ | Χ | Χ | Χ | Χ | Χ | 18 h | 59 h | |
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