lcd12864 pin link about micropython-st7565 HOT 3 CLOSED

pin
RST CS D7 D6 D5 D4 D3 D2 D1 D0 WR RD RS _ VCC GND

from micropython-st7565.

This is an 8-bit bi-directional data bus that connects to an 8-bit or 16-bit standard MPU data bus. When the serial interface (SPI-4) is selected (P/S = “L”) : D7 : serial data input (SI) ; D6 : the serial clock input (SCL). D0 to D5 should be connected to VDD or floating. When the chip select is not active, D0 to D7 are set to high impedance.

from micropython-st7565.

You need to find a P/S pin. Maybe as solder jumper, maybe on ribbon cable.

from micropython-st7565.