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參數(shù)資料
| 型號： | MSM6542-01 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT |
| 中文描述： | 實時時鐘周期和報警輸出 |
| 文件頁數(shù)： | 23/54頁 |
| 文件大小： | 378K |
| 代理商： | MSM6542-01 |
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Semiconductor
MSM6542-01/02/03
90
ii)
In the alarm pulse output mode (when the IT/PLS
2
bit is 0)
0 is written in the IRQ FLAG
2
bit
with DP set at 0
Output timing
"0"
"1"
"0"
IRQ FLAG
2
IRQ FLAG
0
Automatic restoration
61μs
c)
REST (D
2
) (RESeT)
This bit resets the less-than-second counter. While the bit is 1, the counter is being reset.
When 0 is written in the bit, reset is canceled.
When CS
goes low, the REST bit is automatically set at 0. When 1 is written in the bit, the
TEST
1
and TEST
2
bits of the C
C
' register are also set at 0.
d)
IRQ FLAG
0
(D
3
) (Interrupt ReQuest FLAG
0
)
This bit indicates whether the extended time zone for interrupt output is in progress when
the DP is 1. The bit is set at 1 when: (1) the D
(IT/PLS
) bit of the C
register is 1 (periodic
interrupt mode) or the D
(IT/PLS
) bit of the C
registe is 1 (alarm interrupt mode), (2) the
D
(DP) bit of the C
' register is 1 (data protect mode), and (3) 122
μ
s (extended time zone)
do not elapse after a periodic interrupt or an alarm interrupt occurs. When 122
μ
s elapse
after occurrence of such an interrupt, the bit is automatically set at 0.
The bit is not cleared when it is read. Also, data cannot be written in the bit.
C
F
Register (Control F Register)
a)
READ FLAG (D
0
)
This bit indicates a one-second carry. It is used to read time data.
When the READ FLAG bit is read, it is reset at 0. The status lasts until the less-than-second
realtime counter generates a carry to the one-second counter.
When a carry to the one-second realtime counter is generated, the READ FLAG bit is set at
1. The status lasts until the bit is read.
When a carry to the one-second realtime counter is generated with the READ FLAG bit set
at 1, the bit remains unchanged, i.e., at 1.
The READ FLAG bit is also set at 1 when 30-s adjustment is performed by software or
hardware. The status last until the bit is read.
For the usage of the READ FLAG bit, see "Reading registers" in reference flowcharts.
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