PT7C4363 Datasheet, PDF (7/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module (I2C Bus)

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