Isolation-free in-circuit programming system and in-circuit programmer

Abstract

Disclosed is an isolation-free in-circuit programming system including an in-circuit programmer and an application board connected to the in-circuit programmer through a peripheral interface bus and having a bus controller and a memory, wherein the bus controller is connected to the memory through a system bus, in which the in-circuit programmer includes a leakage current discharging circuit connected to the bus controller for detouring a leakage current flowing from the memory or the in-circuit programmer to the bus controller to flow therethrough. The in-circuit programmer also includes an input level shifter for receiving data signals from the memory and adjusting the high-level input voltage of the in-circuit programmer to decode any weak high-level output voltage from the memory, thereby allowing the high-level output voltage of the memory to be higher than the high-level input voltage of the in-circuit programmer.

Description

technical field [0001] The present invention relates to a physical circuit burner, and more particularly, the present invention relates to a non-isolated physical circuit burner system. Background technique [0002] The memory is generally used to store firmware program codes provided to the microprocessor or microcontroller to execute commands. When a memory storing firmware program code is permanently mounted or soldered to a circuit board or computer motherboard for a particular application, and needs to be updated, users tend to allow the memory to be removed from its carrier or unsoldered Perform a firmware update. An in-circuit programmer can directly program a firmware program in a memory in a system (or circuit), and is therefore widely used. [0003] figure 1 A system block diagram of a known in-circuit programming system is shown. Such as figure 1 As shown, the in-circuit programming system includes an in-circuit programmer 100 having a serial communication in...

AI Technical Summary

Problems solved by technology

Although Figure 4 The shown physical circuit programming system with isolation can effectively eliminate the leakage current and ensure good communication between the memory 124 and the physical circuit programmer 100, which will cause a substantial increase in the cost of the application board 120

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