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11 / 92 page 11/92 ST72E121 ST72T121 1.5 OPTION BYTE The user has the option to select software watch- dog or hardware watchdog (see description in the Watchdog chapter). When programming EPROM or OTP devices, this option is selected in a menu by the user of the EPROM programmer before burning the EPROM/OTP. The Option Byte is lo- cated in a non-user map. No address has to be specified. The Option Byte is at FFh after UV eras- ure and must be properly programmed to set de- sired options. OPTBYTE Bit 7:4 = Not used Bit 3 = Reserved, must be cleared. Bit 2 = Reserved, must be set on ST72T121N de- vices and must be cleared on ST72T121J devices. Bit 1 = Not used Bit 0 = WDG Watchdog disable 0: The Watchdog is enabled after reset (Hardware Watchdog). 1: The Watchdog is not enabled after reset (Soft- ware Watchdog). 70 - - - - b3 b2 - WDG 11 |
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