t81l0003b TM Technology Inc., t81l0003b Datasheet - Page 11

• Manufacturer Part Number: t81l0003b
• Description: 8-bit Mcu
• Manufacturer: TM Technology Inc.

Special Function Registers
a) Interrupt Enable 0 register (ien0)
The ien0 register (address : A8)
The ien0 bit functions
Note: other bits are not used to watchdog control
The ien0 bit functions
b) Interrupt Enable 1 register (ien1)
The ien1 register (Address : B8)
The ien1 bit functions
Pay attention that when write ien1.6, it write the swdt bit, when read ien1.6, we will read out the wdts bit. Ie. Watch dog
timer status flag. Set by hardware when the watchdog timer was started.
c) Watchdog Timer Reload register (wdtrel)
The wdtrel register ( Address : 86 )
The wdtrel bit functions
The wdtrel register can be loaded and read any time
TM Technology Inc. reserves the right
to change products or specifications without notice.
Ien1.6
ien0.6
wdtrel.6 t0
tm
wdtrel.7
wdtrel.0
Bit
Bit
MSB
MSB
MSB
eal
Bit
7
-
Symbol
Symbol
swdt
CH
wdt
TE
Symbol
swdt
wdt
6
6-0
7
Function
Watchdog timer start refresh flag.
Set to active/refresh the watchdog timer. When directly set after setting wdt, a watchdog timer
refresh is performed. Bit swdt is reset by hardware 12 instruction cycles after it has been set.
Function
Watchdog timer refresh flag.
Set to initiate a refresh of the watchdog timer. Must be set directly before swdt is set to prevent
an unintentional refresh of the watchdog timer. The wdt is reset by hardware 12 instruction
cycles after it has been set.
Function
Prescaler select bit. When set, the watchdog is clocked through an additional
divide-by-16 prescaler
Seven bit reload value for the high-byte of the watchdog timer. This value is loaded
to the wdt when a refresh is triggered by a consecutive setting of bits wdt and swdt
pt2
et2
5
es0
ps
4
pt1
et1
P. 11
3
px1
ex1
2
pt0
et0
Publication Date: NOV. 2005
1
T81L0003B
LSB
LSB
LSB
px0
ex0
0
Revision:A