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ST7263BEx bảng dữ liệu(PDF) 55 Page - STMicroelectronics

tên linh kiện ST7263BEx
Giải thích chi tiết về linh kiện  Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI and I²C
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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ST7263Bxx
On-chip peripherals
Doc ID 7516 Rev 8
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Figure 26.
Watchdog block diagram
a
Note:
Following a reset, the watchdog is disabled. Once activated it cannot be disabled, except by
a reset.
The T6 bit can be used to generate a software reset (the WDGA bit is set and the T6 bit is
cleared).
11.1.4
Software Watchdog option
If Software Watchdog is selected by option byte, the watchdog is disabled following a reset.
Once activated it cannot be disabled, except by a reset.
The T6 bit can be used to generate a software reset (the WDGA bit is set and the T6 bit is
cleared).
11.1.5
Hardware Watchdog option
If Hardware Watchdog is selected by option byte, the watchdog is always active and the
WDGA bit in the CR is not used.
11.1.6
Low power modes
WAIT instruction
No effect on Watchdog.
Table 17.
Watchdog timing (fCPU = 8 MHz)
CR register initial value
WDG timeout period (ms)
Max
FFh
393.216
Min
C0h
6.144
RESET
WDGA
7-BIT DOWNCOUNTER
fCPU
T6
T0
CLOCK DIVIDER
WATCHDOG CONTROL REGISTER (CR)
÷49152
T1
T2
T3
T4
T5



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