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RM0016 데이터시트(PDF) 132 Page - STMicroelectronics

부품명 RM0016
상세설명  STM8S Series and STM8AF Series 8-bit microcontrollers
PDF  467 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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RM0016 데이터시트(HTML) 132 Page - STMicroelectronics

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Window watchdog (WWDG)
RM0016
132/467
DocID14587 Rev 14
15.6
Hardware watchdog option
If hardware watchdog is selected by option byte, the watchdog is always active and the
WDGA bit in the WWDG_CR register is not used. Refer to the option byte description in the
datasheet.
15.7
Using Halt mode with the WWDG (WWDGHALT option)
The following recommendation applies if Halt mode is used when the watchdog is enabled.
Before executing the HALT instruction, refresh the WDG counter, to avoid an unexpected
WWDG reset immediately after waking up the microcontroller.
15.8
WWDG interrupts
None.
15.9
WWDG registers
15.9.1
Control register (WWDG_CR)
Address offset: 0x00
Reset value: 0x7F
7
654
3210
WDGA
T6
T5
T4
T3
T2
T1
T0
rs
rw
rw
rw
rw
rw
rw
rw
Bit 7 WDGA: Activation bit(1)
This bit is set by software and only cleared by hardware after a reset. When WDGA = 1, the watchdog
can generate a reset.
0: Watchdog disabled
1: Watchdog enabled
Bits 6:0 T[6:0]: 7-bit counter (MSB to LSB)
These bits contain the value of the watchdog counter. It is decremented every 12288 fCPU cycles
(approximately). A reset is produced when it rolls over from 0x40 to 0x3F (T6 becomes cleared).
1. This bit is not used if the hardware watchdog option is enabled by option byte.



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