Preliminary
S3C2451
RISC MICROPROCESSOR
Real Time Clock
14-5
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
RTC clock
(32. 768KHz)
Counter
Compare
Tick
interrupt
RTCCON[4]
Tick time interrupt
enable (1bit)
TICK TIME COUNT REGISTER
1
0
2. 048KHz
cnt15
rtcif
Q1N
RTCCON[8:5]
Q15N
Q8N
TICCNT0[6:0] TICCNT1[7:0]
TICCNT2[16:0]
Figure 14-2. RTC tick interrupt clock scheme
Example) For 1 ms Tick interrupt generation.
1
st
)
RTCCON[0]= 1’b1 ( RTC enable )
2
nd
)
RTCCON[3]=1’b1 ( RTC clock counter reset).
3
rd
)
RTCCON[3] = 1’b0 ( RTC clock counter enable)
4
th
)
RTCCON[8:5] = 4’b0011 ( RTC divide clock selection.)
5
th
)
TICNT1[6:0] = 7’h1 (Tick counter value setting).
6
th
)
TICNT0[7] = 1’b1 (Tick counter enable).