PT7C4363 查看數據表（PDF） - Pericom Semiconductor
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PT7C4363 Datasheet PDF : 22 Pages
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Data Sheet
PT7C4363
Real-time Clock Module (I2C Bus)
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b) Timer Interrupt
• TIE: Timer Interrupt Enable bit.
TIE
Data
Read / Write
0 Timer interrupt disabled
1 Timer interrupt enabled
Description
Default
• TF: Timer Flag
TF
Read
Write
Data
Description
0 Timer flag inactive
1 Timer flag active. At the end of a timer countdown, TF is set to 1.
0 Timer flag is cleared
1 Timer flag remains unchanged
• TI/TP: Timer Interrupt output select
TI/TP
Data
Description
Read / Write
0 INT is active when TF is active (subject to the status of TIE)
INT pulses active according to source clock frequency and timer count down value (subject to
the status of TIE).
Source clock INT negative pulse width (s)
(Hz)
n=1
n>1
4096
1/8192
1/4096
1
64
1/128
1/64
1
1/64
1/64
1/60
1/64
1/64
Note: TF and INT become active simultaneously.
n = loaded countdown value. Timer stopped when n = 0.
Example 1: If TE = 1, TD1 TD0 = 00, Timer = 03, TIE = 1, TF = 0, TI/TP = 1 are written into PT7C4363, timer register counts
down every 1/4.096kHz seconds from 03 to 01 then 03 cycled and INT output negative pulse with 1/4096 seconds width. See Fig.1.
4.096kHz internal clock
INT
Timer=02
Timer=01
Timer=03
Timer=02
Timer=01
Timer=03
Set TF=1
Fig.1 Example 1 of timer interrupts
PT0207(07/05)
7
Ver: 0
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