This document describes how the non-volatile static memory array and the quartz-controlled clock oscillator in STMicroelectronics' TIMEKEEPER® devices are interconnected, and how the time data is updated.
This document explains the nature of variability in time updates for STMicroelectronics TIMEKEEPER® devices. It details how non-volatile memory and clock oscillators are interconnected and how time data is updated from the system side to the user side. The variability, which can range from 0.5 ms to 3.5 ms, is caused by ripple carries through the seven clock registers (seconds, minutes, hours, day, date, month, year) during updates.
The delay can vary from 0.5 ms to 3.5 ms.
Newer devices such as M48T02, M48T12, M48T08/Y, M48T18, M48T58/Y (revision C), M48T35/Y, M48T35AV, M48T37Y/V and M48T201Y/V use a fixed delay.
Each pulse is delayed by the same delta time of 3.5 ms.