Samsung S3C6400X User Manual page 1059

S3C6400
RISC MICROPROCESSOR
SPECIAL FUNCTION REGISTER
MEMORY MAP
Register Address
WTCON 0x7E004000
WTDAT 0x7E004004
WTCNT 0x7E004008
WTCLRINT 0x7E00400c
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
WTCON 0x7E004000
WTCON
Prescaler value
Reserved
Watchdog timer
Clock select
Interrupt generation
Reserved
Reset enable/disable
R/W Description
R/W Watchdog timer control register
R/W Watchdog timer data register
R/W Watchdog timer count register
W Watchdog timer interrupt clear register
R/W Description
R/W Watchdog timer control register
Bit Description
[15:8] Prescaler value.
The valid range is from 0 to (2
[7:6] Reserved.
These two bits must be 00 in normal operation.
[5] Enable or disable bit of Watchdog timer.
0 = Disable
1 = Enable
[4:3] Determine the clock division factor.
00: 16
10: 64
[2] Enable or disable bit of the interrupt.
0 = Disable
1 = Enable
[1] Reserved.
This bit must be 0 in normal operation.
[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.
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.
8
-1).
01 : 32
11 : 128
Watchdog Timer
Reset Value
0x8021
0x8000
0x8000
-
Reset Value
0x8021
Initial State
0x80
00
1
00
0
0
1
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