STC (Macro Crystal)/USB to Dual Serial Port-STC8H-V1.0 USB to 2 Groups of Serial Port Module Kernel STC8H8K64U -86543

When using the SPI interface, only solder the left RI3 and R16, not the right R14 and R17

When using the 2C interface, only the R14 and R17 on the right are soldered, and the RI3 and R16 on the left are not soldered

The factory defaults to using the SPI interface, only welding the left RI3 and R16

J2, J2B, and J2C share a 7-core socket, so there is only J2 on the PCB, without J2B or J2C

OLED display                                               OLED display

SPI 7-wire interface                                 2C7 line interface   2C4 line interface

Download instructions for USB upgrade firmware of the upper master chip STC8H8K64U hardware:

Because the USB-HID communication protocol is used, there is no need to install any drivers.

STC's MCU with hardware USB now supports downloading user programs using its own hardware USB,

ISP download steps:

1. D-P3.0, D+/P3.1 are well connected to the PCUSB port

2. Short circuit P3.2 to GND, press the P3.2/Downloaded button on the board

3. Power on the target chip again, regardless of whether the board has been powered on previously, press the power switch key on the board to power off,

Then release the power and wait for "STC USB Writer (HID1)" to be automatically recognized in the STC-ISP download software

Once identified, it has nothing to do with the P3.2 state. You can now release the P3.2 key.

4. Click the "Download/Program" button in the download software (Note: The operation sequence is different from that of serial port download)

Download succeeded!

Note: From the user area soft reset to the system area, it is waiting for USB download