
PRELIMINARY
Real Time Clock
S3C6400
RISC MICROPROCESSOR
33-6
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.
INDIVIDUAL REGISTER DESCRIPTIONS
REAL TIME CLOCK CONTROL (RTCCON) REGISTER
The RTCCON register consists of 9 bits such as the RTCEN. It controls the read/write enable of the BCD SEL,
CNTSEL and CLKRST for testing.
RTCEN bit can control all interfaces between the CPU and the RTC, Therefore it must be set to 1 in an RTC
control routine to enable data read/write after a system reset. Before power off, the RTCEN bit must be cleared
to 0 to prevent inadvertent writing into RTC registers.
Register
Address
R/W
Description
Reset Value
RTCCON 0x7E005040
R/W
RTC control Register
0x0
RTCCON
Bit
Description
Initial State
TICEN
[8]
Tick timer enable
0 = Disable 1 = Enable
0
Reserved [7:4] Reserved
CLKRST
[3]
RTC clock count reset.
0 = No reset, 1 = Reset
0
CNTSEL [2]
BCD
count
select.
0 = Merge BCD counters
1 = Reserved (Separate BCD counters)
0
CLKSEL
[1]
BCD clock select.
0 = XTAL 1/2
15
divided clock
1 = Reserved (XTAL clock only for test)
0
RTCEN [0] RTC
control
enable.
0 = Disable 1 = Enable
Note: When RTCEN is enable, BCD time count setting, RTC clock
counter reset and read operation can be performed.
0
Note:
TIC Counter is enabled / disabled at TICCLK rising edge.
If TICEN is high, TIC counter is updated at TICCLK rising edge
But, if TICEN is low, TIC counter is cleared at TICCLK rising edge.
TICK TIME COUNT REGISTER (TICNT)
Register
Address
R/W
Description
Reset Value
TICNT 0x57000044
R/W
Tick time count register
0x0
TICNT
Bit
Description
Initial State
TICK TIME
COUNT
[15:0]
16 bit tick time count value
16’b0