w925e625 ETC-unknow, w925e625 Datasheet - Page 43

• Manufacturer Part Number: w925e625
• Description: 8-bit Cid Microcontroller
• Manufacturer: ETC-unknow

Note: Central tone is DB (440 Hz).
WATCHDOG TIMER
The Watchdog timer is a free-running timer that can be programmed by the user to serve as a system
monitor, a time-base generator or an event timer. It is a set of dividers that divides the system clock.
The divider output is selectable and determines the time-out interval. In the condition of the timer-out
expiring, the WDT interrupt and WDT reset may be executed if the corresponding enable control bits
are set. The interrupt will occur if the individual interrupt enable and the global enable are set. The
interrupt and reset functions are independent of each other and may be used separately or together
depending on the users software.
Fsub
Fosc
T
O
N
E
WFS(WDCON.4)
RWT (WDCON.0)
Reset Watchdog
C
C
D
D
E
F
F
G
G
A
A
B
Table 5 The relation between the tone frequency and the preset value of TM0
#
#
#
#
#
frequency
130.81
138.59
146.83
155.56
164.81
174.61
185.00
196.00
207.65
220.00
233.08
246.94
Tone
1
3rd octave
TM0 preset value
& BUZ frequency
83H
8AH
90H
97H
9DH
A2H
A7H
ACH
B1H
B6H
BAH
BEH
13
16
19
15
18
21
12
131.07
138.84
146.28
156.03
165.49
174.30
184.09
195.04
207.39
221.40
234.05
248.24
Figure 6-7 Watchdog Timer
00
01
10
11
frequency
261.63
277.18
293.66
311.13
329.63
349.23
369.99
392.00
415.30
440.00
466.16
493.88
Enable Watchdog timer reset
Tone
WD1,WD0
Time-out
selector
EWT(WDCON.1)
- 43 -
4th octave
TM0 preset value
& BUZ frequency
C1H
C5H
C8H
CBH
CEH
D1H
D4H
D6H
D9H
DBH
DDH
DF
H
EWDI(EIE.5)
260.06
277.69
292.57
309.13
327.68
348.58
372.35
390.08
420.10
442.81
468.11
496.48
512 clock
WDIF
delay
Publication Release Date: July 4, 2005
WTRF
frequency
523.25
554.37
587.33
622.25
659.26
698.46
739.99
783.99
830.61
880.00
932.23
987.77
Tone
W925E/C625
5th octave
Interrupt
TM0 preset value
& BUZ frequency
E1H
E3H
E4H
E6H
E7H
E9H
EAH
EBH
ECH
EDH
EEH
EFH
Revision A10
528.51
564.96
585.14
630.15
655.36
712.34
744.72
780.19
819.20
862.84
910.22
963.76
Reset