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ST7L15 bảng dữ liệu(PDF) 50 Page - STMicroelectronics

tên linh kiện ST7L15
Giải thích chi tiết về linh kiện  8-bit MCU for automotive with single voltage Flash/ROM memory, data EEPROM, ADC, 5 timers, SPI
PDF  138 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7L15 bảng dữ liệu(HTML) 50 Page - STMicroelectronics

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11 ON-CHIP PERIPHERALS
11.1 WATCHDOG TIMER (WDG)
11.1.1 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 upon expiration of a
programmed time period, unless the program re-
freshes the counter’s contents before the T6 bit is
cleared.
11.1.2 Main Features
■ Programmable free-running downcounter (64
increments of 16000 CPU cycles)
■ Programmable reset
■ Reset (if watchdog activated) when the T6 bit
reaches zero
■ Optional
reset
on
HALT
instruction
(configurable by option byte)
■ Hardware Watchdog selectable by option byte
11.1.3 Functional Description
The counter value stored in the CR register (bits
T[6:0]) is decremented every 16000 machine cy-
cles and the length of the timeout period can be
programmed by the user in 64 increments.
If the watchdog is activated (the WDGA bit is set)
and when the 7-bit timer (bits T[6:0]) rolls over
from 40h to 3Fh (T6 becomes cleared), it initiates
a reset cycle pulling low the reset pin for typically
30µs.
Figure 31. Watchdog Block Diagram
RESET
WDGA
7-bit DOWNCOUNTER
fCPU
T6
T0
CLOCK DIVIDER
WATCHDOG CONTROL REGISTER (CR)
÷16000
T1
T2
T3
T4
T5
1



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