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UPSD3253 Datasheet(PDF) 52 Page - STMicroelectronics

Part # UPSD3253
Description  Flash Programmable System Devices with 8032 Microcontroller Core and 256Kbit SRAM
PDF  176 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD3253 Datasheet(HTML) 52 Page - STMicroelectronics

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µPSD325X DEVICES
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Watchdog reset pulse width depends on the clock
frequency. The reset period is Tfosc x 12 x 222
The RESET pulse width is Tfosc x 12 x 215.
Figure 21. RESET Pulse Width
Table 34. Watchdog Timer Clear Register (WDRST: 0A6H)
Table 35. Description of the WDRST Bits
Note: The Watchdog Timer (WDT) is enabled at power-up or reset and must be served or disabled.
76543210
Reserved
WDRST6
WDRST5
WDRST4
WDRST3
WDRST2
WDRST1
WDRST0
Bit
Symbol
Function
7
—
Reserved
6 to 0
WDRST6 to
WDRST0
To reset watchdog timer, write any value beteen 00h and 7Eh to this register.
This value is loaded to the 7 most significant bits of the 22-bit counter.
For example: MOV WDRST,#1EH
Reset period
(1.258 second at 40Mhz)
(about 6.291 seconds at 8Mhz)
Reset pulse width (about 10ms at 40Mhz, about 50ms at 8Mhz)
AI06823



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