1. giveyourmcupoweronreset。
2. stopoperation thenre-selectCOMPort。
3. becauseplcc-dip \/ PQFP-DIPSockettracetoolong。
4. updatethestcisp.exeversion。
5. Ifstillerror yourMCUFirmwareiserrorornull. Chinese: connection failure, please try the following: 1. Power on the MCU\/ MCU reset (cold start, first no power, then power on). 2. Stop the download, select the RS-232 serial port again, and connect the cable. 3. Due to the length of the PLCC and PQFP converter base lead, the clock oscillation is incorrect, please adjust the parameters. 4. You may want to upgrade the STCISP.exe software on the PC. 5. If it still fails, there may be no ISP system boot code in the MCU\/ MCU, or it needs to be returned for upgrade, or the MCU is damaged. MCUTypeis: STC89C\/LE51RCMCUFirmwareVersion: 3.8 CChinese: MCU firmware version number: 3.8 CDoublespeed (6 clock)\/double speed: NoOSCDN (OSCControl)\/oscillator control: ful lgain next download P1.0,P1.1 is not related to download Erase AP area Erase dataflash area :No Allow access to internal extension RAM(MCU new version C version is valid) User software after starting the watchdog, reset the watchdog (MCU new version C version is valid)