Programming mode entry switching control method and programming mode entry switching control device

Abstract

The invention provides a programming mode entry switching control method. The programming mode entry switching control method includes steps that a chip receives a programming instruction transmitted by a programmer, enters a pre-programming mode according to the programming instruction and starts timing; the chip judges whether verification information transmitted by the programmer is received within first time or not; a specific value is set for a check register of the chip if the verification information is received by the chip within the first time; the programmer reads the check register after the first time elapses, and whether the specific value is stored in the check register or not is judged; the chip enters a programming mode under the control of the programmer if the specific value is stored in the check register, so that the chip can be programmed. The programming mode entry switching control method has the advantage that a specific handshake operation is carried out on the external programmer and an internal circuit of the chip after high-pressure pulses are received, so that the programming mode switching safety can be greatly improved. The invention further provides a programming mode entry switching control device.

Description

technical field [0001] The invention relates to the field of computer applications, in particular to a switching control method and device for entering a programming mode. Background technique [0002] With the development of design and manufacturing technology, integrated circuit design has developed from the integration of transistors to the integration of logic gates, and now to the integration of IP (Internet Protocol, a protocol for interconnection between networks), that is, Soc (System-on- a-chip, system-level chip) design technology, and has been widely used in various fields such as network, handheld communication equipment, national defense and military, consumer electronics and automation control. [0003] In the design of Soc, the software programs in the system are generally solidified in the internal memory of the processor. Such memories include ROM (Read-Only Memory, read-only memory), EPROM (Erasable Programmable Read-Only Memory, erasable Programmable Read...

AI Technical Summary

Problems solved by technology

[0006] However, the existing solutions have the following problems: it may cause the chip to enter the programming state of the flash due to some accident in actual application, thereby causing serious consequences to the misoperation of the flash

Specifically, the IO ports corresponding to PGC and PGD are multiplexed as UART communication. There may be a high-voltage pulse on PGC or PGD due to some accident, and then the flash will enter the programming state, so that TXD, which was originally used as UART communication, RXD two ports are misused for flash programming, which may have serious consequences for flash erasure

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