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ST72141K2 Datasheet(PDF) 75 Page - STMicroelectronics

Part # ST72141K2
Description  8-BIT MCU WITH ELECTRIC-MOTOR CONTROL, ADC, 16-BIT TIMERS, SPI INTERFACE
PDF  132 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72141K2 Datasheet(HTML) 75 Page - STMicroelectronics

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8.2 WATCHDOG TIMER (WDG)
8.2.1 Introduction
The Watchdog timer is used to detect the occur-
rence of a software fault, usually generated by ex-
ternal interference or by unforeseen logical condi-
tions, which causes the application program to
abandon its normal sequence. The Watchdog cir-
cuit generates an MCU reset on expiry of a pro-
grammed time period, unless the program refresh-
es the counter’s contents before the T6 bit be-
comes cleared.
8.2.2 Main Features
s
Programmable timer (64 increments of 12288
CPU cycles)
s
Programmable reset
s
Reset (if watchdog activated) after a HALT
instruction or when the T6 bit reaches zero
s
Watchdog Reset indicated by status flag
Figure 44. Watchdog Block Diagram
RESET
WDGA
7-BIT DOWNCOUNTER
fCPU
T6
T0
CLOCK DIVIDER
WATCHDOG CONTROL REGISTER (CR)
÷ 12288
T1
T2
T3
T4
T5



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