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PRELIMINARY
S3C6400
RISC MICROPROCESSOR
Watchdog Timer
34-3
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.
SPECIAL FUNCTION REGISTER
MEMORY MAP
Register
Address
R/W
Description
Reset Value
WTCON 0x7E004000
R/W
Watchdog
timer control register
0x8021
WTDAT 0x7E004004
R/W
Watchdog timer data register
0x8000
WTCNT 0x7E004008
R/W
Watchdog
timer count register
0x8000
WTCLRINT
0x7E00400c
W
Watchdog timer interrupt clear register
-
INDIVIDUAL REGISTER DESCRIPTION
WATCHDOG TIMER CONTROL (WTCON) REGISTER
The WTCON register allows the user to enable/disable the watchdog timer, select the clock signal from 4
different sources, enable/disable interrupts, and enable/disable the watchdog timer output.
The Watchdog timer is used to resume the S3C6400 restart on mal-function after its power on; if controller
restart is not desired, the Watchdog timer must be disabled.
If the user wants to use the normal timer provided by the Watchdog timer, enable the interrupt and disable the
Watchdog timer.
Register
Address
R/W
Description
Reset Value
WTCON 0x7E004000
R/W
Watchdog
timer control register
0x8021
WTCON
Bit
Description
Initial State
Prescaler value
[15:8]
Prescaler value.
The valid range is from 0 to (2
8
-1).
0x80
Reserved [7:6]
Reserved.
These two bits must be 00 in normal operation.
00
Watchdog timer
[5]
Enable or disable bit of Watchdog timer.
0 = Disable
1 = Enable
1
Clock select
[4:3]
Determine the clock division factor.
00: 16
01 : 32
10: 64
11 : 128
00
Interrupt generation
[2]
Enable or disable bit of the interrupt.
0 = Disable
1 = Enable
0
Reserved [1]
Reserved.
This bit must be 0 in normal operation.
0
Reset enable/disable
[0]
Enable or disable bit of Watchdog timer output for reset
signal.
1: Assert reset signal of the S3C6400 at watchdog time-out
0: Disable the reset function of the watchdog timer.
1