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Reset locking shielding circuit of watchdog circuit

A shielding circuit and watchdog technology, applied in the field of watchdog circuits, can solve problems such as download failures and achieve the effect of ensuring smooth operation

Active Publication Date: 2009-12-16
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application, the external watchdog requires the MCU to continuously send out dog feeding signals to reset the watchdog. Otherwise, the watchdog count overflows, and a reset signal will be sent to force the MCU to reset, interrupting the ongoing download operation. , causing the download to fail

Method used

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  • Reset locking shielding circuit of watchdog circuit
  • Reset locking shielding circuit of watchdog circuit
  • Reset locking shielding circuit of watchdog circuit

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Embodiment Construction

[0024] like figure 2 As shown, the watchdog circuit reset locking shielding circuit of the present invention comprises: a watchdog circuit D, a reset input terminal MR of the watchdog chip U8 connected in the watchdog circuit and a dog feeding signal output terminal WDO There is a reset lock shielding module 100 between them, and the reset lock shielding module 100 is used to shield the watchdog count reset signal during in-circuit programming. The reset lock masking module 100 includes a signal latch unit 101 for latching the external program memory read strobe signal PSEN and uses the external program memory read strobe signal PSEN to shield the reset input terminal transmitted to the watchdog chip U8 The signal masking unit 102 of the reset input signal of MR.

[0025] like image 3 As shown, the signal latch unit 101 of the watchdog circuit reset locking shielding circuit of the present invention is a D flip-flop U6, the trigger terminal C of the D flip-flop U6 is conne...

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PUM

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Abstract

The invention relates to a reset locking shielding circuit of a watchdog circuit, comprising the watchdog circuit (D) and a reset locking shielding module (100) arranged between a reset input end (MR) and a dog feeding output end (WDO) of a watchdog chip (U8) in the watchdog circuit, wherein the reset locking shielding module (100) is used for shielding a watchdog count reset signal in on-line programming. The reset locking shielding circuit of the watchdog circuit ensures the smoothing running of program download because the reset locking shielding module (100) shields the watchdog count reset signal in on-line programming.

Description

technical field [0001] The present invention relates to a watchdog circuit, more specifically, to a reset lock shielding circuit of the watchdog circuit. Background technique [0002] ATMEL's 8051 series MCU AT89C52ED2 has an automatic in-circuit programming function (ISP), and its built-in boot program (BOOT ROM), the MCU enters the programming mode by pulling down the level of the external program memory read strobe signal output (PSEN) during reset. , and then use the serial port to download the program from the host computer to the flash memory (FLASH) of the single-chip microcomputer. It enters the reset output (RST) and PSEN timing of in-circuit programming mode as follows figure 1 shown. The download software FLIP provided by ATMEL can choose to send PSEN and RST signals through the host computer to form the timing sequence of entering ISP mode, which is very convenient and safe to use. However, in the application, the external watchdog requires the MCU to continuo...

Claims

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Application Information

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IPC IPC(8): G06F11/00
Inventor 刘衍志
Owner VERTIV CORP