參數(shù)資料
型號: W78E858
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 8 BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40
封裝: DIP-40
文件頁數(shù): 22/33頁
文件大小: 1186K
代理商: W78E858
W78E858
- 22 -
6.19.1 WDTC (8FH)
BIT
7
NAME
ENW
FUNCTION
Enable watch-dog timer if set.
Clear watch-dog timer and prescaler if set. This flag will be cleared auto-
matically.
If this bit is set, watch-dog is enabled under idle mode. If cleared, watch-dog
is disable under idle mode. Default is cleared.
Reversed.
Watch-dog prescaler timer select.
Watch-dog prescaler timer select.
Watch-dog prescaler timer select.
6
CLRW
5
WIDL
4
3
2
1
0
-
PS2
PS1
PS0
PS2
0
0
0
0
1
1
1
1
PS1
0
1
0
1
0
0
1
1
PS0
0
0
1
1
0
1
0
1
PRESCALER SELCET
2
4
8
16
32
64
128
256
WATCH-DOG TIME-OUT PERIOD (F
OSC
= 20 MHz)
19.66 mS
39.32 mS
78.64 mS
157.28 mS
314.57 mS
629.14 mS
1.25 mS
2.52 mS
6.20 Programmable Clock-out
A 50% duty cycle clock can be programmed to come out on P1.0. To configure the timer/counter2 as
a clock generator, bit C/T2 in T2CON register must be cleared and bit T2OE in T2MOD register must
be set. Bit TR2 (T2CON.2) also must be set to start timer. The clock-out frequency depends on the
oscillator frequency and reload value of Timer2 capture register (RCAP2H, RCAP2L) as shown in this
equation:
r
oscillatot
×
))
2
,
2
(
65536
(
4
L
RCAP
H
RCAP
frequency
In the clock-out mode, timer2 roll-overs will not generate an interrupt. This is similar to when it is used
as a baud-rate generator. It is possible to use Timer2 as a baud-rate generator and a clock and a
clock generator simultaneously.
6.21 Reduce EMI Emission
The transition of ALE will cause noise, so it cab be turned off to reduce the EMI emission if it is
useless. Turn off the ALE signal transition only need too set the ALEOFF flag in the AUXR register
When ALE is turned off, it will be reactived when program access external ROM or RAM data or jump
to execute external ROM code. After access completely or program returns to internal ROM code,
ALE signal will turn off again.
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