Real-time clock unit circuit capable of automatically calculating week value

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like figure 1 As shown, a real-time clock unit circuit that can automatically calculate the value of the week, including a second clock generator, a second counter, a minute counter, an hour counter, a day counter, a month counter, a year counter, a week calculator, an alarm clock generator, and a read and write access control circuit. If the alarm clock function is not required, the logic circuit of the alarm clock generator can be deleted.

[0043] The real-time clock unit circuit contains year, month, day, hour, minute and second counters, each of which corresponds to a register. Accordingly, the week calculator corresponds to a week register. The alarm generator corresponds to four alarm value registers of day / week, hour, minute and second. A control register RTC_CR and a status register RTC_SR are arranged in the read-wri