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| 型號： | HE84G770B |
| 廠商： | King Billion Electronics Co., Ltd. |
| 英文描述： | 8-BIT MICRO-CONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 39/61頁 |
| 文件大?。?/td> | 817K |
| 代理商： | HE84G770B |
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16.
Time Base
King Billion Electronics Co., Ltd
駿
億
電
子
股
份
有
限
公
司
HE84G770
HE80004H SERIES
October 31, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
39
Version:V1.1
The TB timer is used to generate time-out interrupt at fixed period. The time-out frequency of TB is
determined by dividing slow clock with a factor selected in OP2[3..0]. TBE (Time Base Enable) bit
controls enable or disable of the circuit.
OP2
Field
Mode
Reset
Bit 7
IDLE
R/W
0
Bit 6
PNWK TCWK
R
-
Bit 5
Bit 4
TBE
R/W
0
Bit 3
Bit 2
TBS[3..0]
R/W
-
Bit 1
Bit 0
R
-
R/W
-
R/W
-
R/W
-
TBE
0
1
Function
Disable Time Base
Enable Time Base
For example, if the slow clock is 32768 Hz, then the interrupt frequency is as shown in following table.
TBS[3..0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Interrupt Frequency
16.384 KHz
8.192 KHz
4.096 KHz
2.048 KHz
1.024 KHz
512 Hz
256 Hz
128 Hz
64 Hz
32 Hz
16 Hz
8 Hz
4 Hz
2 Hz
1 Hz
0.5 Hz
17.
Watch Dog Timer
Watch Dog Timer (WDT) is designed to reset system automatically and prevents system dead lock caused
by abnormal hardware activities or program execution. The WDT needs to be enabled in Mask Option.
MO_WDTE
0
1
Function
WDT disable
WDT enable
Using the WDT function, the “CLRWDT” instruction needs to be executed in every possible program
path when the program runs normally in order to clears the WDT counter before it overflows, so that the
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