RX - 8581 SA / JE / NB
8.5.2. Related registersAddress | Function | bit 7 | bit 6 | bit 5 | bit 4 | bit 3 | bit 2 | bit 1 | bit 0 | |
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1 | MIN | ! | 40 | 20 | 10 | 8 | 4 | 2 | 1 | |
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2 | HOUR | ! | ! | 20 | 10 | 8 | 4 | 2 | 1 | |
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3 | WEEK | ! | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
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4 | DAY | ! | ! | 20 | 10 | 8 | 4 | 2 | 1 | |
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8 | MIN Alarm | AE | 40 | 20 | 10 | 8 | 4 | 2 | 1 | |
9 | HOUR Alarm | AE | • | 20 | 10 | 8 | 4 | 2 | 1 | |
A | WEEK Alarm | AE | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
DAY Alarm | • | 20 | 10 | 8 | 4 | 2 | 1 | |||
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D | Extension Register | TEST | WADA | USEL | TE | ! | ! | TSEL1 | TSEL0 | |
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E | Flag Register | ! | ! | UF | TF | AF | ! | VLF | ! | |
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F | Control Register | ! | ! | UIE | TIE | AIE | ! | STOP | RESET |
∗1) "o" indicates
∗2) Bits marked with "• " are RAM bits that can contain any value and are
∗Before entering settings for operations, we recommend writing a "0" to the AIE bit to prevent hardware interrupts
from occurring inadvertently while entering settings.∗When the STOP bit or RESET bit value is "1" alarm interrupt events do not occur.
∗When the alarm interrupt function is not being used, the Alarm registers (Reg - 8 to A) can be used as a RAM register. In such cases, be sure to write "0" to the AIE bit.
∗When the AIE bit value is "1" and the Alarm registers (Reg - 8 to A) is being used as a RAM register, /INT may be changed to low level unintentionally.
1) WADA (Week Alarm /Day Alarm) bitThe alarm interrupt function uses either "Day" or "Week" as its target. The WADA bit is used to specify either WEEK or DAY as the target for alarm interrupt events.
| WADA | Data | Description | |
| 0 | Sets WEEK as target of alarm function | |
| (DAY setting is ignored) | ||
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1 | Sets DAY as target of alarm function | ||
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| (WEEK setting is ignored) | ||
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Address | Function | bit 7 | bit 6 | bit 5 | bit 4 | bit 3 | bit 2 | bit 1 | bit 0 | |
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8 | MIN Alarm | AE | 40 | 20 | 10 | 8 | 4 | 2 | 1 | |
9 | HOUR Alarm | AE | • | 20 | 10 | 8 | 4 | 2 | 1 | |
A | WEEK Alarm | AE | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
DAY Alarm | • | 20 | 10 | 8 | 4 | 2 | 1 | |||
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The hour, minute, date or day when an alarm interrupt event will occur is set using this register and the WADA bit.
In the WEEK alarm /Day alarm register (Reg - A), the setting selected via the WADA bit determines whether WEEK alarm data or DAY alarm data will be set. If WEEK has been selected via the WADA bit, multiple days can be set (such as Monday, Wednesday, Friday, Saturday).
When the settings made in the alarm registers and the WADA bit match the current time, the AF bit value is changed to "1". At that time, if the AIE bit value has already been set to "1", the /INT pin goes low.
∗1) The register that "1" was set to "AE" bit, doesn't compare alarm.(Example) Write 80h (AE = "1") to the WEEK Alarm /DAY Alarm register (Reg - A):Only the hour and minute settings are used as alarm comparison targets. The week and date settings are not used as alarm comparison targets.
As a result, alarm occurs if only an hour and minute accords with alarm data.∗2) If all three AE bit values are "1" the week/date settings are ignored and an alarm interrupt event will occur once per minute.
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