t81l0003a TM Technology Inc., t81l0003a Datasheet - Page 17

• Manufacturer Part Number: t81l0003a
• Description: Reduced I/o 8-bit Mcu
• Manufacturer: TM Technology Inc.

tm
**Note :
clk: external clock input
Tclk: clock period
wdt: watchdog timer registers
wdts: watchdog timer status flag
reset: external reset input
rst: internally generated reset signal
!
Reset time=(7FFCh-wdth.wdtl)*presc*48/ClockFrequency
while presc=16 if wdtrel.7=1, presc=1 if wdtrel.7=0.
For example if you use frequency clock=12MHz, wdtrel=10111111b which means wdtrel.7=1 and wdth=3Fh
Then reset time= (7FFCh-3F00h)*48/12M=66544 us
Instruction Set
AC Electrical Characteristics
(Ta=0
TM Technology, Inc. reserves the right
to change products or specifications without notice.
Symbol
Tcntin
Twdt
Reset Time Formula
Dclk
Tdrh
o
Trst
fclk
C~70
o
C, VDD=3.3V, VSS=0V)
CH
TE
Device reset hold time
Input CLK Duty cycle
Counter input period
RESET pulse width
Clock frequency
Watchdog timer
Parameter
(Fully Compatible standard MCS-51 Instruction)
Clock frequency=12MHz
RC Type(R=47KOhm)
Crystal Type
Condition
Ta=25
o
C
P. 17
16128
Min
11.4
45
9*fclk
2*fclk
Typ
Publication Date: SEP. 2004
50
12
T81L0003A
2096000
Max
12.6
55
37
Revision: C
MHz
MHz
Unit
us
%