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| 型號(hào)： | MC80F0216K |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁(yè)數(shù)： | 47/128頁(yè) |
| 文件大小： | 1408K |
| 代理商： | MC80F0216K |
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Preliminary
MC80F0208/16/24
MAR. 2005 Ver 0.2
43
12. WATCHDOG TIMER
The watchdog timer rapidly detects the CPU malfunction such as
endless looping caused by noise or the like, and resumes the CPU
to the normal state. The watchdog timer signal for detecting mal-
function can be selected either a reset CPU or a interrupt request.
When the watchdog timer is not being used for malfunction de-
tection, it can be used as a timer to generate an interrupt at fixed
intervals.
The watchdog timer has two types of clock source. The first type
is an on-chip RC oscillator which does not require any external
components. This RC oscillator is separate from the external os-
cillator of the X
IN
pin. It means that the watchdog timer will run,
even if the clock on the X
IN
pin of the device has been stopped,
for example, by entering the STOP mode. The other type is a
prescaled system clock.
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 re-
quest flag is generated. This can be used as Watchdog timer inter-
rupt or reset the CPU in accordance with the bit WDTON.
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.
The RC oscillated watchdog timer is activated by setting the bit
RCWDT as shown below.
LDM
LDM
LDM
STOP
NOP
NOP
:
CKCTLR,#3FH; enable the RC-OSC WDT
WDTR,#0FFH ; set the WDT period
SSCR, #5AH ;ready for STOP mode
; enter the STOP mode
; RC-OSC WDT running
The RC-WDT oscillation period is vary with temperature, V
DD
and process variations from part to part (approximately,
33~100uS). The following equation shows the RCWDT oscillat-
ed watchdog timer time-out.
T
RCWDT
=CLK
RCWDT
×2
8
×
WDTR + (CLK
RCWDT
×2
8)
/2
where, CLK
RCWDT
= 33~100uS
In addition, this watchdog timer can be used as a simple 7-bit tim-
er by interrupt WDTIF. The interval of watchdog timer interrupt
is decided by Basic Interval Timer. Interval equation is as below.
T
WDT
= (WDTR+1)
×
Interval of BIT
Figure 12-1 Block Diagram of Watchdog Timer
to reset CPU
BASIC INTERVAL TIMER
OVERFLOW
Count
source
enable
Watchdog
Counter (7-bit)
7-bit compare data
comparator
Watchdog Timer interrupt
clear
clear
WDTIF
WDTCL
“0”
“1”
WDTON in CKCTLR [0F2
H
]
Watchdog Timer
Register
WDTR
Internal bus line
7
[0F4
H
]
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