Real-time timepiece chip interface circuit control method and real-time timepiece control circuit

Abstract

The invention discloses a control method for a real-time clock chip interface circuit, a real-time clock circuit and a programmable logical circuit for the control of the real-time clock chip, wherein, the control method for the real-time clock chip interface circuit comprises the following procedures: procedure S102, wherein, a CPU system sends out the requests of reading / writing operation to a programmable logical device; and procedure S104, wherein, the programmable logical device performs reading or writing operation on the real-time clock chip according to requests received. Therefore, the invention significantly reduces the stress of CPU and saves a huge amount of time through a hardware-realizing mode, thereby not only improving the real-time performance of processing but also avoiding reading-writing conflicts.

Description

technical field [0001] The invention relates to the field of electronic technology, and more specifically, to a control method of a real-time clock chip interface circuit, a real-time clock control circuit, and a programmable logic circuit for controlling the real-time clock chip. Background technique [0002] In the field of electronic application design, the design of a real-time clock is required in many occasions as a time-based record or reference time for alarms or performance statistics, and its performance directly affects the quality of the entire system. A real-time clock often needs to meet the following conditions: [0003] First, accurate online timing; [0004] Second, more accurate timing can still be maintained within a period of time when the power is cut off; [0005] Third, during the network operation, the operation of frequently reading the time will not cause too heavy load on the system. [0006] The usual practice in the art is to use the I2C inter...

AI Technical Summary

Problems solved by technology

So if the time is frequently read, and the CPU has other important tasks to perform, the CPU will be overwhelmed; if there are some tasks with strong real-time requirements, the consequences will be disastrous

Another problem is: the CPU reading time is at the nanosecond level, and the access speed is very fast. It is very likely that the CPU reading occurs during the period when the data transmitted by the I2C bus has not been completed. At this time, it is very likely to read the wrong data. time

[0008] Patent No. 200420041374.X describes a real-time clock control circuit, but it has the danger of overloading the CPU and inaccurate time when doing frequent time reading operations

[0009] Therefore, in order to overcome the problem that the real-time clock in the prior art causes the CPU to be overloaded and make mistakes when it is frequently read, it is necessary to provide a control method for a real-time clock chip interface circuit with high integration and strong functions.

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