AN925 Datasheet (STMicroelectronics) - Time Update in STs TIMEKEEPER Devices

AN925, Time Update in STs TIMEKEEPER Devices

AN925 APPLICATION NOTE Time Update in ST’s TIMEKEEPER Devices Figure 1 shows how the non-volatile, static memory array and the quartz controlled clock oscillator, of TIMEKEEPER devices from STMicroelectronics, are interconnected through the clock registers.

The clock registers are mapped into the memory array (please see the data sheet for the precise mapping) as 8 or 16 BYTEWIDE BIPORT memory cells.

The time data in these memory cells are updated from the clock side (the system side) and are m