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參數(shù)資料
| 型號： | 935262218112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 30/32頁 |
| 文件大小： | 711K |
| 代理商： | 935262218112 |
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Philips Semiconductors
PCF8563
Real-time clock/calendar
Product specication
16 April 1999
7 of 30
9397 750 04855
Philips Electronics N.V. 1999. All rights reserved.
8.6.2
Control/Status 2 register
[1]
TF and INT become active simultaneously.
[2]
n = loaded countdown timer value. Timer stopped when n = 0.
Table 7:
Description of Control/Status 2 register bits description (address 01H)
Bit
Symbol Description
7 to 5
0
By default set to logic 0.
4
TI/TP
TI/TP = 0: INT is active when TF is active (subject to the status of TIE).
TI/TP = 1: INT pulses active according to Table 8 (subject to the status
of TIE). Note that if AF and AIE are active then INT will be permanently
active.
3
AF
When an alarm occurs, AF is set to logic 1. Similarly, at the end of a
timer countdown, TF is set to logic 1. These bits maintain their value
until overwritten by software. If both timer and alarm interrupts are
required in the application, the source of the interrupt can be
determined by reading these bits. To prevent one ag being
overwritten while clearing another, a logic AND is performed during a
write access. See Table 9 for the value descriptions of bits AF and TF.
2TF
1
AIE
Bits AIE and TIE activate or deactivate the generation of an interrupt
when AF or TF is asserted, respectively. The interrupt is the logical OR
of these two conditions when both AIE and TIE are set.
AIE = 0: alarm interrupt disabled; AIE = 1: alarm interrupt enabled.
TIE = 0: timer interrupt disabled; TIE = 1: timer interrupt enabled.
0
TIE
Table 8:
INT operation (bit TI/TP = 1)
Source clock (Hz)
INT [1] period (s)
n [2] =1
n>1
4 096
1
8192
1
4096
64
1
128
1
64
1
64
1
64
1
60
1
64
1
64
Table 9:
Value descriptions for bits AF and TF
R/W
Bit: AF
Bit: TF
Value Description
Read
0
alarm ag inactive
0
timer ag inactive
1
alarm ag active
1
timer ag active
Write
0
alarm ag is cleared
0
timer ag is cleared
1
alarm ag remains unchanged
1
timer ag remains unchanged
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