HE84760 Datasheet, PDF (22/31 Pages) King blillion Electronics Co.,Ltd. – 8-bit Micro-controller

King Billion Electronics Co., Ltd
駿億電子股份有限公司
HE84760
HE80000 SERIES
13. Time Base Interrupt
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
R
-
Bit 5
TCWK
R
-
Bit 4
TBE
R/W
0
Bit 3
W
-
Bit 2 Bit 1
TBS[3..0]
W
W
-
-
Bit 0
W
-
TBE
Function
0 Disable Time Base
1 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
14. Watch Dog Timer
Watch Dog Timer (WDT) is designed to reset system automatically prevent system dead lock caused by
abnormal hardware activities or program execution. WDT needs to be enabled in Mask Option.
MO_WDTE
Function
0
WDT disable
1
WDT enable
To use WDT function, “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
August 15, 2003
Page 22 of 31
V1.2
This specification is subject to change without notice. Please contact sales person for the latest version before use.