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Clone Philip Chip P87C751 Source Code needs to have understanding about the programming process, which also include progrmaming the watchdog timer.

If the user does not employ the watchdog function, the watchdog subsystem can be used as a timer. In this mode, reaching the terminal count sets a flag to ease the progress of MCU Reading. In most other respects, the timer mode possesses the characteristics of the watchdog mode. This is done to protect the integrity of the watchdog function.

The watchdog timer subsystem consists of a prescaler and a main counter. The prescaler has 8 selectable taps off the final stages and the output of a selected tap provides the clock to the main counter. The main counter is the section that is loaded as a result of the software feeding the watchdog and it is the section that causes the system reset (watchdog mode) or time-out flag to be set (timer mode) if allowed to reach its terminal count.

Both the EPROM and ROM devices have a set of SFRs for holding the watchdog autoload values and the control bits. The watchdog time-out flag is present in the watchdog control register and operates the same in all versions. In the EPROM device, the watchdog parameters (autoload value and control) are always taken from the SFRs to facilitate the process of Clone Philip P87C52 Memory Program.

In the ROM device, the watchdog parameters can be mask programmed or taken from the SFRs. The selection to take the watchdog parameters from the SFRs or from the mask programmed values is controlled by EA (external access).

When EA is high (internal ROM access), the watchdog parameters are taken from the mask programmed values. If the watchdog is mask programmed to the timer mode, then the autoload values and the pre-scaler taps are taken from the SFRs.

Clone Philip Chip P87C751 Source Code

When EA is low (external access), the watchdog parameters are taken from the SFRs. The user should be able to leave code in his program which initializes the watchdog SFRs in order to Clone NXP Microprocessor P87L51FA Source Code even though he has migrated to the mask ROM part. This allows no code changes from EPROM prototyping to ROM coded production parts.