FDD8880 DataSheet
DATASHEET
FDD8880 描述
A short program illustrating the initialization and basic function of the watchdog timer is shown below. It illustrates the Timed Access feature, which prevents the accidental modification of the watchdog control bits. A Timed Access operation is a sequence of steps that must be executed together, in sequence; otherwise, the access fails. The example program shows the timed access being used for restarting the watchdog and enabling its reset. Further details on Timed Access operation may be found in the Secure Microcontroller User´s Guide. The watchdog timer bits that are protected by the Timed Access procedure are the Enable Watchdog Timer Reset (EWT;PCON.2) and Restart Watchdog Timer(RWT;IP.7) bits.
FDD8880 特点
LED Drive Outputs (pins 7, 8, 9, and 10) These four pins are driven to low levels when the FDD8880 is transmitting or receiving RS232 or OBD data. Otherwise, they are at a high level. Current capability is suitable for directly driving most LEDs through current limiting resistors. If unused, these pins should be left open-circuited.
FDD8880 应用
Technical/Catalog InformationFDD8880VendorFairchild SemiconductorCategoryDiscrete Semiconductor Products Mounting Type