Maxim Integrated Secure Microcontroller - Manual (Page 91)

Secure Microcontroller User’s Guide
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10.5 Transient Voltage Protection
The microprocessor provides protection from transients through a built in power-fail/power-on reset and
Watchdog Timer. Each of these functions should be initialized by the user as part of the reset routine. The
following code demonstrates the set up for a user that will support the Watchdog function.
TA EQU 0C7h
ORG
00h
SJMP Start
Org
30h
Start :
MOV
TA, #0Aah ;Timed
MOV TA, #55h ; Access
ORL IP, #80h ;Set RWT to restart the Watchdog Timer
MOV
TA, #0Aah ;Timed
MOV TA, #55h ; Access
ORL PCON, #44h ;Set POR (PCON.6) bit for power-on reset detect
; and enable Watchdog Timer by setting EWT
(PCON.2)