HYUNDAI MicroElectronics
11. WATCHDOG TIMER
GMS81C2012/GMS81C2020
The watchdog timer rapidly detects the CPU malfunction
such as endless looping caused by noise or the like, and re-
sumes the CPU to the normal state.
The watchdog timer signal for detecting malfunction can
be selected either a reset CPU or a interrupt request.
Note: Because the watchdog timer counter is enabled af-
ter clearing Basic Interval Timer, after the bit WDTON set to
"1", maximum error of timer is depend on prescaler ratio of
Basic Interval Timer. The 7-bit binary counter is cleared by
setting WDTCL(bit7 of WDTR) and the WDTCL is cleared
automatically after 1 machine cycle.
When the watchdog timer is not being used for malfunc-
tion detection, it can be used as a timer to generate an in-
terrupt at fixed intervals. The purpose of the watchdog
timer is to detect the malfunction (runaway) of program
due to external noise or other causes and return the opera-
tion to the normal condition.
The RC oscillated watchdog timer is activated by setting
the bit RCWDT as shown below.
LDM
LDM
STOP
NOP
NOP
:
CKCTLR,#3FH; enable the RC-osc WDT
WDTR,#0FFH; set the WDT period
; enter the STOP mode
The watchdog timer has two types of clock source.
; RC-osc WDT running
The first type is an on-chip RC oscillator which does not
require any external components. This RC oscillator is sep-
arate from the external oscillator of the Xin pin. It means
that the watchdog timer will run, even if the clock on the
Xin pin of the device has been stopped, for example, by en-
tering the STOP mode.
The RCWDT oscillation period is vary with temperature,
VDD and process variations from part to part (approxi-
mately, 40~120uS). The following equation shows the
RCWDT oscillated watchdog timer time-out.
T
= C LK RC W D T×28×[W D TR.6~0]+ (C LK RC W D T×28)/2
RCW D T
The other type is a prescaled system clock.
where, C LK
= 40~120uS
RCW D T
The watchdog timer consists of 7-bit binary counter and
the watchdog timer data register. When the value of 7-bit
binary counter is equal to the lower 7 bits of WDTR, the
interrupt request flag is generated. This can be used as
WDT interrupt or reset the CPU in accordance with the bit
WDTON.
In addition, this watchdog timer can be used as a simple 7-
bit timer by interrupt WDTIF. The interval of watchdog
timer interrupt is decided by Basic Interval Timer. Interval
equation is as below.
T
WDT = [WDTR.6~0] × Interval of BIT
clear
Watchdog
Counter (7-bit)
clear
BASIC INTERVAL TIMER
OVERFLOW
Count
source
“0”
to reset CPU
“1”
comparator
enable
WDTON in CKCTLR [0ECH]
WDTCL
7-bit compare data
WDTIF
7
Watchdog Timer interrupt
Watchdog Timer
Register
WDTR
[0EDH]
Internal bus line
Figure 11-1 Block Diagram of Watchdog Timer
MAR. 2000 Ver 1.00
45
HYNIX [ HYNIX SEMICONDUCTOR ]
